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Spin and spin current -- From fundamentals to recent progress
Sadamichi Maekawa, Takashi Kikkawa, Hiroyuki Chudo +2
Along with the progress of spin science and spintronics research, the flow of electron spins, (i.e. spin current), has attracted interest. New phenomena and electronic states were…
Microscopic mechanism of high-temperature ferromagnetism in Fe, Mn, and Cr-doped InSb, InAs, and GaSb magnetic semiconductors
Jing-Yang You, Bo Gu, Sadamichi Maekawa +1
In recent experiments, high Curie temperatures Tc above room temperature were reported in ferromagnetic semiconductors Fe-doped GaSb and InSb, while low Tc between 20 K to 90 K wer…
Enhancement of domain-wall mobility detected by NMR at the angular momentum compensation temperature
Masaki Imai, Hiroyuki Chudo, Mamoru Matsuo +2
The angular momentum compensation temperature of ferrimagnets has attracted much attention because of high-speed magnetic dynamics near . We show that NMR ca…
Angular momentum compensation manipulation to room temperature of the ferrimagnet HoDyFeO detected by the Barnett effect
Masaki Imai, Hiroyuki Chudo, Masao Ono +5
We demonstrate that the angular momentum compensation temperature , at which the net angular momentum in the sample disappears, can be controlled in HoFeO by pa…
Dirac-Surface-State Modulated Spin Dynamics in a Ferrimagnetic Insulator at Room Temperature
Chi Tang, Qi Song, Cui-Zu Chang +10
This work demonstrates dramatically modified spin dynamics of magnetic insulator (MI) by the spin-momentum locked Dirac surface states of the adjacent topological insulator (TI) wh…
Quantum Materials for Spin and Charge Conversion
Wei Han, YoshiChika Otani, Sadamichi Maekawa
Spintronics aims to utilize the spin degree of freedom for information storage and computing applications. One major issue is the generation and detection of spins via spin and cha…
Observation of gyromagnetic reversal
Masaki Imai, Yudai Ogata, Hiroyuki Chudo +6
We report direct observation of gyromagnetic reversal, which is the sign change of gyromagnetic ratio in a ferrimagnet HoFeO, by using the Barnett effect measurement…
Enhanced Magneto-optical Kerr Effect at Fe/Insulator Interfaces
Bo Gu, Saburo Takahashi, Sadamichi Maekawa
Using density functional theory calculations, we have found an enhanced magneto-optical Kerr effect in Fe/insulator interfaces. The results of our study indicate that interfacial F…
Magnetization dynamics and its scattering mechanism in thin CoFeB films with interfacial anisotropy
Atsushi Okada, Shikun He, Bo Gu +9
Studies of magnetization dynamics have incessantly facilitated the discovery of fundamentally novel physical phenomena, making steady headway in the development of magnetic and spi…
New p- and n-type ferromagnetic semiconductors: Cr-doped BaZn2As2
Bo Gu, Sadamichi Maekawa
We find new ferromagnetic semiconductors, Cr-doped BaZn2As2, by employing a combined method of the density functional theory and the quantum Monte Carlo simulation. Due to a narrow…
Thermoelectric generation based on spin Seebeck effects
Ken-ichi Uchida, Hiroto Adachi, Takashi Kikkawa +5
The spin Seebeck effect (SSE) refers to the generation of a spin current as a result of a temperature gradient in magnetic materials including insulators. The SSE is applicable to…
Diluted magnetic semiconductors with narrow band gaps
Bo Gu, Sadamichi Maekawa
We propose a method to realize diluted magnetic semiconductors (DMS) with p- and n-type carriers by choosing host semiconductors with a narrow band gap. By employing a combination…
Magnon instability driven by heat current in magnetic bilayers
Yuichi Ohnuma, Hiroto Adachi, Eiji Saitoh +1
We theoretically demonstrate that, in a ferromagnet/paramagnet bilayer, a magnon instability accompanied by a gigahertz microwave emission can be driven simply by means of a temper…
What determines the sign of the spin Hall effects in Cu alloys doped with 5d elements?
Zhuo Xu, Bo Gu, Michiyasu Mori +2
We perform a systematical analysis of the spin Hall effect (SHE) in the Cu alloys doped with a series of 5d elements, by the combined approach of density functional theory and Hart…
Observation of huge thermal spin currents in magnetic multilayers
R. Ramos, T. Kikkawa, M. H. Aguirre +11
Thermal spin pumping constitutes a novel mechanism for generation of spin currents; however their weak intensity constitutes a major roadblock for its usefulness. We report a pheno…
Photoemission and X-ray Absorption Studies of the Diluted Magnetic Semiconductor BaK(ZnMn)As Isostructural to Fe-based Superconductors
H. Suzuki, K. Zhao, G. Shibata +14
The electronic and magnetic properties of a new diluted magnetic semiconductor (DMS) BaK(ZnMn)As, which is isostructural to so-called 122-ty…
Spin Hall effect by surface roughness
Lingjun Zhou, Vahram L. Grigoryan, Sadamichi Maekawa +2
The spin Hall effect and its inverse effect, caused by the spin orbit interaction, provide the interconversion between spin current and charge current. Since the effects make it po…
Enhanced DC Spin Pumping into a Fluctuating Ferromagnet near Tc
Yuichi Ohnuma, Hiroto Adachi, Eiji Saitoh +1
A linear-response formulation of the dc spin pumping, i.e., a spin injection from a precessing ferromagnet into an adjacent spin sink, is developed in view of describing many-body…
Sign change of the spin Hall effect due to electron correlation in nonmagnetic CuIr alloys
Zhuo Xu, Bo Gu, Michiyasu Mori +2
Recently a positive spin Hall angle (SHA) of 0.021, was observed experimentally in nonmagnetic CuIr alloys [Niimi et al., Phys. Rev. Lett. 106, 126601 (2011)] and attributed predom…
Enhanced spin Hall effect by electron correlations in CuBi alloys
Bo Gu, Zhuo Xu, Michiyasu Mori +2
A recent experiment in CuBi alloys obtained a large spin Hall angle (SHA) of -0.24 (Niimi et al. Phys. Rev. Lett. 109, 156602 (2012)). We find that the SHA can be dramatically enha…
Rashba Spin-Orbit Anisotropy and the Electric Field Control of Magnetism
Stewart E. Barnes, Jun'ichi Ieda, Sadamichi Maekawa
The control of the magnetism of ultra-thin ferromagnetic layers using an electric field rather than a current, if large enough, would lead to many technologically important applica…
New Diluted ferromagnetic semiconductor Li(Zn,Mn)P with decoupled charge and spin doping
Z. Deng, K. Zhao, B. Gu +15
We report the discovery of a new diluted magnetic semiconductor, Li(Zn,Mn)P, in which charge and spin are introduced independently via lithium off-stoichiometry and the isovalent s…
Observation of the spin Seebeck effect in epitaxial Fe3O4 thin films
R. Ramos, T. Kikkawa, K. Uchida +8
We report the first experimental observation of the spin Seebeck effect in magnetite thin films. The signal observed at temperatures above the Verwey transition is a contribution f…
Spin Seebeck effect in antiferromagnets and compensated ferrimagnets
Yuichi Ohnuma, Hiroto Adachi, Eiji Saitoh +1
We theoretically investigate the spin Seebeck effect (SSE) in antiferromagnets and ferrimagnets, and show that the SSE vanishes in antiferromagnets but survives in ferrimagnets eve…