Spin Dynamics in Magnetic Materials: Spin Resistivity, Spin Waves, Spin-Orbit Coupling, Phase Transition

A special issue of Condensed Matter (ISSN 2410-3896). This special issue belongs to the section "Magnetism".

Deadline for manuscript submissions: 30 September 2024 | Viewed by 3961

Special Issue Editor

Special Issue Information

Dear Colleagues,

Spin dynamics determines the principal properties of magnetic materials which give rise to numerous applications. In this Special Issue, we welcome papers and reviews on all topics concerning spin dynamics, including spin transport, spin waves, spin–orbit coupling, and phase transition.

The first topic of this Special Issue is the study of the behavior of resistivity due to the motion of spins. This is one of the fundamental tasks in materials science at present. This is because transport properties occupy the first place in electronic devices and applications. The motion of a spin depends on its orientation with respect to lattice spin orientations. The well-known CMR (colossal magneto-resistance) is an example of spin transport. Other hot subjects which study spin resistivity for applications are spin–orbit torques, and the spin Hall effect. Spin resistivity has been investigated intensively both experimentally and theoretically for more than five decades. The rapid development of the field is due mainly to the many applications in spintronics. Experiments have been performed in many magnetic materials, including metals, semiconductors, and superconductors. One interesting aspect of magnetic materials is the existence of a magnetic phase transition from a magnetically ordered phase to the paramagnetic (disordered) state which drastically modifies resistivity. As for theories, many investigations have been carried out, but much is still unknown. Monte Carlo (MC) simulations have also been performed to study spin resistivity. Other systems in which the motion of a spin depends on the lattice geometry, the applied magnetic and electric fields, such as spin Hall, etc. are also under intensive investigations.

Another topic is spin waves in magnetic materials. Much research has been conducted on ferromagnets and antiferromagnets where spin configurations are collinear. However, new materials show that non-collinear spin states such as topological spin structures (skyrmions) due to competing interactions have more potential applications in spintronics. For these structures, it seems that no study of spin waves has been carried out so far.

Phase transitions including dynamic phase transitions and quantum phase transitions are also hot topics in frustrated spin systems. While the critical properties of phase transitions in non-frustrated collinear magnets have been well understood, phase transitions in non-collinear spin structures including skyrmions remain desirable.

The purpose of this Special Issue is to provide a collection of reviews and original papers on various phenomena due to spin dynamics. We have mentioned just a few of these above. We welcome original research papers, reviews, and surveys on rapidly developed theoretical, numerical, or experimental domains.

Prof. Dr. Hung T. Diep
Guest Editor

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Keywords

  • spin resistivity in magnetically ordered systems
  • colossal magneto-resistance
  • spin–orbit torques
  • spin Hall conductivity
  • anomalous Hall resistivity
  • Monte Carlo simulations of spin resistivity
  • experiments on spin resistivity
  • theories on spin resistivity
  • any subject treating spin motion in materials

Published Papers (2 papers)

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Research

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10 pages, 1003 KiB  
Article
Elucidation of Spin-Correlations, Fermi Surface and Pseudogap in a Copper Oxide Superconductor
by Hiroshi Kamimura, Masaaki Araidai, Kunio Ishida, Shunichi Matsuno, Hideaki Sakata, Kenji Sasaoka, Kenji Shiraishi, Osamu Sugino, Jaw-Shen Tsai and Kazuyoshi Yamada
Condens. Matter 2023, 8(2), 33; https://doi.org/10.3390/condmat8020033 - 4 Apr 2023
Cited by 1 | Viewed by 1943
Abstract
First-principles calculations for underdoped La2−xSrxCuO4 (LSCO) have revealed a Fermi surface consisting of spin-triplet (KS) particles at the antinodal Fermi-pockets and spin-singlet (SS) particles at the nodal Fermi-arcs in the presence of AF local order. By performing [...] Read more.
First-principles calculations for underdoped La2−xSrxCuO4 (LSCO) have revealed a Fermi surface consisting of spin-triplet (KS) particles at the antinodal Fermi-pockets and spin-singlet (SS) particles at the nodal Fermi-arcs in the presence of AF local order. By performing a unique method of calculating the electronic-spin state of overdoped LSCO and by measurement of the spin-correlation length by neutron inelastic scattering, the origin of the phase-diagram, including the pseudogap phase in the high temperature superconductor, Sr-doped copper-oxide LSCO, has been elucidated. We have theoretically solved the long-term problem as to why the angle-resolved photoemission spectroscopy (ARPES) has not been able to observe Fermi pockets in the Fermi surface of LSCO. As a result, we show that the pseudogap region is bounded below the characteristic temperature T*(x) and above the superconducting transition temperature Tc(x) in the T vs. x phase diagram, where both the AF order and the KS particles in the Fermi pockets vanish at T*(x), whilst KS particles contribute to d-wave superconductivity below Tc. We also show that the relationship T*(xc) = Tc(xc) holds at xc = 0.30, which is consistent with ARPES experiments. At T*(x), a phase transition occurs from the pseudogap phase to an unusual metallic phase in which only the SS particles exist. Full article
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Review

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22 pages, 2283 KiB  
Review
Spin Transport in Magnetically Ordered Systems: Ferromagnets, Antiferromagnets and Frustrated Systems
by Danh-Tai Hoang and Hung T. Diep
Condens. Matter 2023, 8(1), 3; https://doi.org/10.3390/condmat8010003 - 27 Dec 2022
Cited by 1 | Viewed by 1580
Abstract
In this review, we outline the important results on the resistivity encountered by an electron in magnetically ordered materials. The mechanism of the collision between the electron and the lattice spins is shown. Experiments on the spin resistivity in various magnetic materials as [...] Read more.
In this review, we outline the important results on the resistivity encountered by an electron in magnetically ordered materials. The mechanism of the collision between the electron and the lattice spins is shown. Experiments on the spin resistivity in various magnetic materials as well as the theoretical background are recalled. We focus on our works of 15 years of principally using Monte Carlo simulations. In these works, we have studied the spin resistivity in various kinds of magnetic systems ranging from ferromagnets and antiferromagnets to frustrated spin systems. It is found that the spin resistivity shows a broad peak at the transition temperature in systems with a second-order phase transition, while it undergoes a discontinuous jump at the transition temperature of a first-order transition. New results on the hexagonal-close-packed (HCP) antiferromagnet are also shown in extended detail for the Ising case in both the frustrated and non-frustrated parameter regions. Full article
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