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Article

Stress-Induced Magnetic Anisotropy Enabling Engineering of Magnetic Softness and GMI Effect of Amorphous Microwires

by
Paula Corte-León
1,2,
Ahmed Talaat
1,2,
Valentina Zhukova
1,2,
Mihail Ipatov
1,2,
Juan María Blanco
2,
Julián Gonzalez
1 and
Arcady Zhukov
1,2,3,*
1
Department Physics of Materials, Chemistry Faculty, University of Basque Country, UPV/EHU, 20018 San Sebastian, Spain
2
Department of Applied Physics, EIG, University of Basque Country, UPV/EHU, 20018 San Sebastián, Spain
3
IKERBASQUE, Basque Foundation for Science, 48011 Bilbao, Spain
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(3), 981; https://doi.org/10.3390/app10030981
Submission received: 24 December 2019 / Revised: 22 January 2020 / Accepted: 30 January 2020 / Published: 3 February 2020
(This article belongs to the Special Issue Nanostructured and Nanocomposite Materials for Electromagnetic and Sensing Applications)
Browse Figures
Versions Notes

Abstract

:
Stress-annealing enabled a considerable improvement in the GMI effect in both Fe- and Co-rich glass-coated microwires. Additionally, a remarkable magnetic softening can be achieved in stress-annealed Fe-rich microwires. Observed stress-annealing induced magnetic anisotropy is affected by annealing conditions (temperatures and stresses applied during annealing). The highest GMI ratio up to 310% was obtained in stress-annealed Co-rich microwires, although they presented rectangular hysteresis loops. A remarkable magnetic softness and improved GMI ratio over a wide frequency range were obtained in stress-annealed Fe-rich microwires. Irregular magnetic field dependence observed for some stress-annealing conditions is attributed to the contribution of both the inner axially magnetized core and outer shell, with transverse magnetic anisotropy.

Graphical Abstract

1. Introduction

Magnetic wires exhibit versatile physical properties such as the Giant Magnetoimpedance (GMI) effect [1,2,3] and fast propagation of a single domain wall (DW) [4,5]. Although these properties are not solely restricted to amorphous magnetic wires [3,6], the former family presents several advantages, like better mechanical properties [7,8] as well as a fast and inexpensive preparation method involving rapid solidification from the melt [9,10,11]. Consequently, the highest GMI effect and the fastest DW propagation were reported in either Co-rich or Fe-rich amorphous microwires, respectively [4,5,12,13,14]. From the viewpoint of applications, excellent magnetic field sensitivity of the GMI effect reported for soft magnetic wires (up to 10 %/A/m) is certainly of great technological interest [12,13,14,15]. In this context, a number of magnetic sensors and magnetometers enabling the detection of low magnetic field or external parameters (e.g., stresses, temperature) based on GMI effect were designed and reported [16,17,18,19,20,21,22,23,24,25,26,27,28].
On the other hand, thin magnetic wire inclusions can be relevant for some other recent technological developments, like metamaterials [29,30]. In particular, specific magnetic structures containing arrays of amorphous magnetic wires allow us to achieve high sensitivity of the surface impedance to external stimuli and hence are useful for development of tunable metamaterials and metacomposites [30,31,32].
As compared to conventional metamaterials [29], the special feature of tunable metamaterials and metacomposites with soft magnetic wire inclusions is that they can demonstrate strong tunability with respect to the varying of external stimuli, such as magnetic field, mechanical load and heat [30,31,32]. Consequently, metamaterials incorporating arrays of magnetic wires in fiber-reinforced polymer composites are potentially suitable for engineering of electromagnetic functionalities and stress/temperature monitoring.
Industrial applications based on the GMI effect demand a size reduction of the magnetic element [16,17]. Therefore, the development of thin wires exhibiting GMI effect has become a topic of intensive research [4,5,11,12,13,14,15]. Among different preparation techniques of magnetic wires, the so-called Taylor–Ulitovsky method allows for the thinnest wires’ fabrication and reduced dimensions [11,12,13,14,15,16,31,32,33]. In order to observe the GMI effect in thin wires, the skin depth should be lower than the radius of the wire. As such, a decrease in diameter should be associated with an increase in the frequency range for observation of the GMI effect [34,35]. Besides these technical features, the overall cost should be also considered for applications (e.g., smart composites with wire inclusions) where substantial amounts of wires are required.
Excellent soft magnetic properties with enhanced GMI effects are usually reported for as-prepared Co-rich [11,12,13,14,15] and nanocrystalline Fe-rich magnetic microwires [36,37]. The latter are often accompanied with an inherent brittleness of samples over the course of the nanocrystallization process, and therefore alternative stress-annealing approaches have been proposed, to enhance the GMI effect retaining the amorphous structure [38,39]. Stress-annealing can be performed in a temperature range well below the crystallization onset. In addition, the degree of stress-induced anisotropy can be selectively tuned through optimal annealing temperature, time and/or different values of applied stresses. Thus, this contribution aims at providing comparative studies on the effect of stress-induced anisotropy on magnetic softness and GMI effect in Fe-and Co-rich magnetic microwires.

2. Materials and Methods

We studied magnetic properties and GMI effect in Fe75B9Si12C4 (metallic nucleus diameter, d = 15.2 μm, total diameter, D = 17.2 μm) and Co69.2Fe4.1B11.8Si13.8C1.1 (d = 25.6 μm; D = 30.2 μm) microwires prepared by using the Taylor–Ulitovsky technique described elsewhere [11,12]. Fe-rich composition presents positive and high magnetostriction coefficient, λs (about 40 × 10−6) [22,23], while Co-rich wires have low negative and vanishing magnetostriction values (about −3 × 10−7) [40,41].
We measured the impedance, Z, and its magnetic field dependence over a wide range of frequencies (10–900 MHz), using a vector network analyzer. As-prepared and stress-annealed samples were placed in a micro-strip sample holder, and impedance was obtained from the reflection coefficient S11, as described elsewhere [42]. From Z-values obtained for different magnetic fields, H, we evaluated the magnetic field dependences of the GMI ratio, ΔZ/Z, which is defined as follows:
ΔZ/Z = [Z (H) − Z (Hmax)]/Z (Hmax),
where Hmax is the maximum applied DC magnetic field. In order to compare the frequency dependence on the GMI effect, we plotted frequency, f, dependence of a maximum GMI ratio, ΔZ/Zm, defined as a maximum ΔZ/Z obtained at a given frequency.
Hysteresis loops of as-prepared and stress-annealed samples were measured by the flux metric methods described elsewhere [12,38]. For a better comparison of samples annealed under different conditions, we represent the hysteresis loops as the normalized magnetization, M/M0 versus the applied magnetic field, H, where Ms is the magnetic moment at the maximum amplitude of magnetic fields, Hmax.
Annealing treatments were conducted in a conventional furnace, with and without stress, at temperatures, Tann, below the crystallization typically observed above 450–500 °C. The stress-annealing process was performed under the attachment of different mechanical loads, to one end of the microwire. Different values of mechanical loads allowed us to apply tensile stresses during the annealing, σa, up to 900 MPa. The stress value during the annealing, σa, within the metallic nucleus and glass shell was evaluated, as described elsewhere [38,39].

3. Results and Discussion

3.1. Tuning of Fe-Rich Microwires by Stress-Annealing

As expected for Fe-rich microwires with high and positive λs values, the as-prepared sample presents rectangular hysteresis loop with coercivity, Hc, of about 55 A/m (see Figure 1a). Annealing without stress did not considerably affect the hysteresis loop shape. Upon annealing at Tann = 350 °C, the hysteresis loop of as-prepared microwires maintained its rectangular shape; however, the coercivity, Hc, slightly decreased up to 50 A/m, as shown in Figure 1b. The hysteresis loop of the sample annealed under stress (Figure 1c) was changed completely: the stress-annealed sample presented a linear hysteresis loop with low values of coercivity (about 17 A/m). Both the stress applied during annealing (Figure 2) and the annealing temperatures (Figure 3) affected the character of hysteresis loops, showing a higher magnetic anisotropy field, Hk, by raising σa or Tann.
Similar to a previously reported GMI effect for Fe-rich microwires, the GMI effect of the as-prepared sample is quite low (Figure 4a). The GMI ratio, ΔZ/Z presented a single peak dependence, with decay from H = 0, as predicted for wires with axial magnetic anisotropy [42,43,44,45]. As can be seen in Figure 4b,c, stress-annealing allowed for considerable improvement of the GMI ratio. Additionally, the character of the ΔZ/Z (H) dependencies became different: starting from f ≥ 100 MHz double peak ΔZ/Z (H), dependencies were observed for stress-annealed samples (Figure 4b,c). Rather unusual character of ΔZ/Z (H) dependencies was observed for the sample annealed σa = 900 MPa (Tann = 300 °C): at intermediate f-values (f = 100 MHz), ΔZ/Z (H) dependence showed an irregular shape, consisting of single and double-peak ΔZ/Z (H) dependencies. Considering the core–shell model [46,47] of the domain structure of magnetic wires (proved experimentally [48]), the radius of the inner axially magnetized core, Rc, can be evaluated based on its relationship with the squareness ratio, Mr/Mo:
Rc = R(Mr/Mo)1/2
where R is the metallic nucleus radius. From observed hysteresis loops in Figure 2 and Figure 3, the reduction of Mr/Mo upon stress-annealing can be evidenced.
On the other hand, the skin depth of a cylindrical magnetic conductor, δ, is affected by the circumferential magnetic permeability, µφ, and by the frequency, f, as follows:
δ = (πσμϕ f)−1/2
where σ is the electrical conductivity. Considering the aforementioned, one can assume the contribution of the inner axially magnetized core for low frequencies and an increase in the contribution of the outer shell with increasing frequency. From frequency dependence of maximum GMI ratio, ΔZ/Zm, evaluated for the as-prepared and stress-annealed samples (Figure 5), we can deduce that stress-annealing allowed the improvement of ΔZ/Zm for a wide frequency range.

3.2. Effects of Stress-Annealing on Magnetic Properties and GMI Effect of Co-Rich Microwires

In contrast to as-prepared Fe-rich samples, as-prepared Co-rich microwires with low negative magnetostriction values (−3 × 10−7) [41] displayed linear and almost unhysteretic hysteresis loops (see Figure 6a). However, as we recently reported elsewhere [43,44], considerable magnetic hardening (coercivity rising by more than one order of magnitude) and transformation of linear hysteresis loop into rectangular is observed even after short-time annealing of Co-rich microwires (Figure 6b). In spite of magnetic hardening, annealed Co-rich samples can show higher GMI effect [44]. Stress-annealing of Co-rich microwires can also prevent magnetic hardening, allowing induction of transverse magnetic anisotropy at high enough annealing temperature and GMI ratio improvement [44]. As can be observed in Figure 6c, stress-annealed Co69.2Fe4.1B11.8Si13.8C1.1 microwires showed lower coercivity, Hc.
As expected, as-prepared the Co69.2Fe4.1B11.8Si13.8C1.1 microwire displays an enhanced GMI effect, as shown in Figure 7a (GMI ratio up to 285%), with a double-peak magnetic-field dependence. Such ΔZ/Z (H) dependencies are ascribed to a circular magnetic anisotropy with high initial permeability and low coercivity typical for Co-rich microwires with vanishing and negative λs values [43,44]. Upon stress-annealing at a fixed Tann = 300 °C /σa = 80 MPa and different annealing time, a noticeable modification of the ΔZ/Z (H) dependencies, either for 10 min (Figure 7b) or 30 min (Figure 7c), has been observed. The maximum GMI ratio, ΔZ/Zm, at f = 100 MHz decreased from 280% to 265% and 250% for samples stress-annealed at 10 and 30 min, respectively. However, stress-annealed samples present higher ΔZ/Zm values at high frequency region (Figure 7b–d). Both stress-annealed samples exhibited maximum on ΔZ/Zm (f) dependence, at about 200 MHz, as can be appreciated from Figure 7d. For annealing time, tann = 10 min, ΔZ/Zm ≈ 310% was achieved (Figure 7b,d). Furthermore, at a lower frequency (10 MHz) the ΔZ/Z (H) dependence showed a single peak character associated with an axial anisotropy induced upon stress-annealing. Observed frequency dependence on ΔZ/Z (H) can be attributed to the radial distribution of magnetic anisotropies in the core–shell domain structure [46,47,48]. Consequently, stress-annealing of Co-rich microwires resulted in an increase in the GMI ratio, at frequencies above 400 MHz, as can be observed in Figure 7d.
Based on these observed dependencies, it can be concluded that stress-annealing is an efficient method for improving the GMI effect in Fe-rich magnetic microwires. Although Co-rich still presents higher GMI ratios, its high cost remains undesirable for some particular applications. Consequently, the advantages of the proposed method allowing GMI-ratio enhancement in Fe-rich microwires is that stress-annealed microwires retain amorphous structure, therefore keeping their excellent plasticity and flexibility, which are typical for amorphous materials.
Presented results are of potential interest for the development of cost-effective magnetic sensors and, more specifically, pT resolution sensors (Electronic Compass for Smart Phones and Biomagnetic Field Sensing, Cardiac Magnetic Activity) [17,49,50] and metamaterials based on the GMI effect [30,31,32]. Developed microwires allow us to achieve extremely high magnetic field sensitivity (up to 10%/A/m), the highest among non-cryogenic devices; therefore, they are suitable for high-performance magnetic sensors [12,13,15]. However, applications of magnetic microwires prepared using the same fabrication method are not restricted to the aforementioned. Recently, other applications of magnetic microwires in medicine, biology, instrumentation, electronic surveillance and the automobile industry, such as magnetic hyperthermia allowing in vitro cancer-cell treatment [51], magnetic shape memory and magnetocaloric effects for magnetic refrigeration [52], and magnetic bistability, allowing magnetic tags development [23], have been proposed.
It is worth noting that the use of nanostructured materials, such as thin films and multilayers, can allow further miniaturization of sensors and devices utilizing the GMI effect [53,54]. Furthermore, thin-film GMI elements are more compatible with integrated electronic devices. However, generally, thin films present a much poorer magnetic softness and GMI ratio. On the other hand, recently, it has been reported that the problem of compatibility of magnetic microwires with integrated electronic circuits was successfully solved [55].
On the other hand, the predicted theoretical maximum GMI ratio is about 3000% [56,57], which is still a few times superior to the experimentally reported ΔZ/Z values [12,13,15]. Therefore, it is expected that technology improvement, as well as the development of effective postprocessing methods, will allow for the achievement of a higher GMI ratio.

4. Conclusions

We studied the effect of stress-annealing on the magnetic properties and GMI effect of Fe- and Co-rich microwires. Stress-annealing allowed remarkable improvement of the GMI effect in both families of magnetic microwires. In Fe-rich microwires, stress-annealing allows for a remarkable magnetic softening. In Co-rich microwires, the highest GMI ratio was observed for stress-annealed Co-rich microwires that presented rectangular hysteresis loops. Stress-annealing induced-magnetic anisotropy was affected by annealing conditions: temperature, time and values of stresses applied during annealing treatments. Stress-annealing allowed for the extension of the frequency range and enhancement of the GMI ratio in both families of studied microwires. Irregular magnetic-field-dependence dependencies of GMI ratio observed in stress-annealed Fe-rich microwires were discussed in terms of the contribution of both inner axially magnetized core and outer shell with transverse magnetic anisotropy.

Author Contributions

Conceptualization, A.Z.; methodology, P.C.-L., A.T. and M.I.; validation, A.Z., J.M.B. and V.Z.; investigation, V.Z., P.C.-L., A.Z. and A.T.; resources, J.G.; data curation, A.Z.; writing—original draft preparation, A.Z. and A.T.; writing—review and editing, A.Z.; visualization, V.Z.; supervision, A.Z.; project administration, A.Z. and J.G.; funding acquisition A.Z. and J.G. All authors have read and agreed to the published version of the manuscript.

Funding

This work was supported by Spanish MCIU, under PGC2018-099530-B-C31 (MCIU/AEI/FEDER, UE), by the Government of the Basque Country under PIBA 2018-44 projects and by the University of Basque Country, under the scheme of “Ayuda a Grupos Consolidados” (Ref.: GIU18/192).

Acknowledgments

The authors thank technical and human support provided by SGIker of UPV/EHU (Medidas Magnéticas Gipuzkoa) and European funding (ERDF and ESF).

Conflicts of Interest

The authors declare no conflicts of interest

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Applsci 10 00981 g001 550
Figure 1. Hysteresis loops of as-prepared (a); annealed at Tann = 350 °C for σa = 0 MPa (b), and at Tann = 350 °C for σa = 190 MPa (c) Fe75B9Si12C4 microwires.
Figure 1. Hysteresis loops of as-prepared (a); annealed at Tann = 350 °C for σa = 0 MPa (b), and at Tann = 350 °C for σa = 190 MPa (c) Fe75B9Si12C4 microwires.
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Figure 2. Hysteresis loops of as-prepared (a); stress-annealed at Tann = 300 °C for σa = 450 MPa (b), and for σa = 900 MPa (c) Fe75B9Si12C4 microwires.
Figure 2. Hysteresis loops of as-prepared (a); stress-annealed at Tann = 300 °C for σa = 450 MPa (b), and for σa = 900 MPa (c) Fe75B9Si12C4 microwires.
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Figure 3. Hysteresis loops of stress-annealed at Tann = 300 °C (a) and Tann = 350 °C for σa = 190 MPa (b) Fe75B9Si12C4 microwires.
Figure 3. Hysteresis loops of stress-annealed at Tann = 300 °C (a) and Tann = 350 °C for σa = 190 MPa (b) Fe75B9Si12C4 microwires.
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Figure 4. ΔZ/Z (H) dependencies of as-prepared (a); stress-annealed at Tann = 300 °C for σa = 390 MPa (b) and for σa = 900 MPa (c) Fe75B9Si12C4 microwires.
Figure 4. ΔZ/Z (H) dependencies of as-prepared (a); stress-annealed at Tann = 300 °C for σa = 390 MPa (b) and for σa = 900 MPa (c) Fe75B9Si12C4 microwires.
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Figure 5. ΔZ/Zm(f) dependencies of Fe75B9Si12C4 as-prepared and stress-annealed microwires.
Figure 5. ΔZ/Zm(f) dependencies of Fe75B9Si12C4 as-prepared and stress-annealed microwires.
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Figure 6. Hysteresis loops of as-prepared (a); annealed at Tann = 300 °C for σa = 0 MPa (b) and for σa = 80 MPa (c) Co69.2Fe4.1B11.8Si13.8C1.1 microwires.
Figure 6. Hysteresis loops of as-prepared (a); annealed at Tann = 300 °C for σa = 0 MPa (b) and for σa = 80 MPa (c) Co69.2Fe4.1B11.8Si13.8C1.1 microwires.
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Figure 7. ΔZ/Z (H) dependencies of as-prepared (a); stress-annealed at Tann = 300 °C under σa = 80 MPa for 10 min (b); 30 min (c), and ΔZ/Zm(f) dependencies of as-prepared and stress-annealed Co69.2Fe4.1B11.8Si13.8C1.1 microwires (d).
Figure 7. ΔZ/Z (H) dependencies of as-prepared (a); stress-annealed at Tann = 300 °C under σa = 80 MPa for 10 min (b); 30 min (c), and ΔZ/Zm(f) dependencies of as-prepared and stress-annealed Co69.2Fe4.1B11.8Si13.8C1.1 microwires (d).
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MDPI and ACS Style

Corte-León, P.; Talaat, A.; Zhukova, V.; Ipatov, M.; Blanco, J.M.; Gonzalez, J.; Zhukov, A. Stress-Induced Magnetic Anisotropy Enabling Engineering of Magnetic Softness and GMI Effect of Amorphous Microwires. Appl. Sci. 2020, 10, 981. https://doi.org/10.3390/app10030981

AMA Style

Corte-León P, Talaat A, Zhukova V, Ipatov M, Blanco JM, Gonzalez J, Zhukov A. Stress-Induced Magnetic Anisotropy Enabling Engineering of Magnetic Softness and GMI Effect of Amorphous Microwires. Applied Sciences. 2020; 10(3):981. https://doi.org/10.3390/app10030981

Chicago/Turabian Style

Corte-León, Paula, Ahmed Talaat, Valentina Zhukova, Mihail Ipatov, Juan María Blanco, Julián Gonzalez, and Arcady Zhukov. 2020. "Stress-Induced Magnetic Anisotropy Enabling Engineering of Magnetic Softness and GMI Effect of Amorphous Microwires" Applied Sciences 10, no. 3: 981. https://doi.org/10.3390/app10030981

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