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Applied Sciences
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Optics in Spintronic Materials
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Optics in Spintronic Materials

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Applied Physics General".

Deadline for manuscript submissions: closed (31 October 2018) | Viewed by 6797

Special Issue Editors

Prof. Dr. Xinyu Liu

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Guest Editor
Professor of Condensed Matter Physics, University of Notre Dame, Notre Dame, IN, USA
Interests: structural, electrical, magnetic and optical properties of diluted magnetic semiconductor alloys and their heterotructures; growth of low-dimensional semiconductor structures by molecular beam epitaxy; physics of quantum materials, including topological insulators; electronic spin phenomena in semiconductor nanostructures
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Sanghoon Lee

E-Mail Website
Guest Editor
Professor of Condensed Matter Physics, Korea University, Seoul, Korea
Interests: MBE growth and characterization of semiconductor nanostructures (quantum well, superlattice, and quantum dot); scanning probe microscopy (SPM); atomic force microscopy (AFM); X-ray; device application for semiconductors (laser, microcavity, waveguide); spin properties of diluted magnetic semiconductors; optical properties (PL, PLE, reflectivity, absorption, and Raman spectroscopy) of semiconductors nanostructures; magnetotransport properties of ferromagnetic semiconductors; ferromagnetic metal; topological insulators

Special Issue Information

Dear Colleagues,

Spintronics is an emerging technology that aims to realize novel electronics by combining traditional functionalities of charge of carriers with their spin degrees of freedom. The applications of spintronics require techniques for injection, detection, manipulation, transport, and storage of spins in spintronic materials. Optical control and read-out of spin-based information is likely to have enormous energy-consumption advantages, and promises to be important for realizing spin-based quantum informatics applications.

Spin phenomena can be observed in a variety of systems, such as diluted magnetic semiconductors, topological insulators, transition-metal dichalcogenides, ferromagnetic and antiferromagnetic materials, etc. In general, spin needs to be localized to a particular region in the host material in order to be available for manipulation and detection. For this purpose, spin localization can be realized by individual impurities, by confinement in quantum dots, by topologically protected surface states, or by combining different materials (heterostructures), by patterned nanostructures, or by other means not yet explored. Such confinement also determines the degree and nature of the coupling with surrounding environment that is critical to the spin-based optical and laser applications. While a great deal of progress and many valuable discoveries have already been made in this area, many important open questions remain. It is, therefore, important to investigate this new frontier by exploring new spintronic systems that can be optically probed, characterized, manipulated and processed. With this in mind, it is our objective to publish a new Special Issue comprised of invited papers aimed at identifying and clarifying new state-of-the-art trends in this area. This Special Issue should discuss prospective applications and to identify issues and questions that remain open in the field of spintronics, so as to provide a better understanding of spin dynamics, spin coherence, and control of these properties. It is expected that publication of such a volume will lead to new exciting science and technology, and will provide groundwork for new advances in this area.

Prof. Dr. Xinyu Liu
Prof. Dr. Sanghoon Lee
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • spintronics
  • antiferromaetic spintronics
  • skyrmionics
  • valleytronics
  • spin injection
  • spin transport
  • spin coherence
  • spin lifetime
  • spin diffusion
  • spin Hall effect
  • spin torque
  • spin wave
  • spin dynamics
  • optical absorption, transmission and reflection
  • magneto-optical Kerr effect
  • magnetic domain walls
  • magnetic semiconductors
  • topological insulators
  • quantum information
  • magnetic nanoparticles
  • magnetic recording
  • magnetoresistance
  • spin orbit coupling
  • ultrashort optical pulse
  • four-wave mixing
  • ultrafast phenomena

Published Papers (2 papers)

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Research

10 pages, 1507 KiB  
Article
Ultrafast Modulation of Magnetization Dynamics in Ferromagnetic (Ga, Mn)As Thin Films
by Hang Li, Xinhui Zhang, Xinyu Liu, Margaret Dobrowolska and Jacek K. Furdyna
Appl. Sci. 2018, 8(10), 1880; https://doi.org/10.3390/app8101880 - 11 Oct 2018
Cited by 1 | Viewed by 2477
Abstract
Magnetization precession induced by linearly polarized optical excitation in ferromagnetic (Ga,Mn)As was studied by time-resolved magneto-optical Kerr effect measurements. The superposition of thermal and non-thermal effects arising from the laser pulses complicates the analysis of magnetization precession in terms of magnetic anisotropy fields. [...] Read more.
Magnetization precession induced by linearly polarized optical excitation in ferromagnetic (Ga,Mn)As was studied by time-resolved magneto-optical Kerr effect measurements. The superposition of thermal and non-thermal effects arising from the laser pulses complicates the analysis of magnetization precession in terms of magnetic anisotropy fields. To obtain insight into these processes, we investigated compressively-strained thin (Ga,Mn)As films using ultrafast optical excitation above the band gap as a function of pulse intensity. Data analyses with the gyromagnetic calculation based on Landau-Lifshitz-Gilbert equation combined with two different magneto-optical effects shows the non-equivalent effects of in-plane and out-of-plane magnetic anisotropy fields on both the amplitude and the frequency of magnetization precession, thus providing a handle for separating the effects of non-thermal and thermal processes in this context. Our results show that the effect of photo-generated carriers on magnetic anisotropy constitutes a particularly effective mechanism for controlling both the frequency and amplitude of magnetization precession, thus suggesting the possibility of non-thermal manipulation of spin dynamics through pulsed laser excitations. Full article
(This article belongs to the Special Issue Optics in Spintronic Materials)
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9 pages, 1476 KiB  
Article
Magneto-Optical Kerr Effect Driven by Spin Accumulation on Cu, Au, and Pt
by Gyung-Min Choi
Appl. Sci. 2018, 8(8), 1378; https://doi.org/10.3390/app8081378 - 15 Aug 2018
Cited by 6 | Viewed by 3707
Abstract
The magneto-optical Kerr effect (MOKE) has recently been achieved on non-ferromagnetic metals by injecting spin currents. To use the magneto-optical Kerr effect as a quantitative tool, it is crucial to study the relationship between the Kerr rotation angle and the spin accumulation on [...] Read more.
The magneto-optical Kerr effect (MOKE) has recently been achieved on non-ferromagnetic metals by injecting spin currents. To use the magneto-optical Kerr effect as a quantitative tool, it is crucial to study the relationship between the Kerr rotation angle and the spin accumulation on non-ferromagnets. In this work, I measure a transient magneto-optical Kerr rotation on non-ferromagnetic metals of Cu, Au, and Pt driven by an ultrafast spin current from an adjacent ferromagnetic metal. Through comparing the measured Kerr rotation and the calculated spin accumulation, I determine the conversion ratio between the Kerr rotation and the spin accumulation to be: −4 × 10−9 (real part), −2.5 × 10−8 (real part), and −3 × 10−9 (imaginary part) rad m A−1 for Cu, Au, and Pt, respectively, at a wavelength of 784 nm. Full article
(This article belongs to the Special Issue Optics in Spintronic Materials)
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