224 citations · 694 across the 25 of their papers we have counts for
21 papers · 1 filter
Light-induced torque in ferromagnetic metals via orbital angular momentum generated by photon-helicity
Koki Nukui, Satoshi Iihama, Kazuaki Ishibashi +7
We investigated photon-helicity-induced magnetization precession in CoPt alloy thin films. In addition to field-like torque, attributable to magnetic field generation…
Magnon-magnon coupling in synthetic ferrimagnets
A. Sud, K. Yamamoto, K. Z. Suzuki +2
Magnetic multilayers with interlayer exchange coupling have been widely studied for both static and dynamic regimes. Their dynamical responses depend on the exchange coupling stren…
Different spin relaxation property observed in linearly and circularly polarized laser induced terahertz emission from Bi/Co bilayer
Kazuaki Ishibashi, Satoshi Iihama, Shigemi Mizukami
Recently, helicity-dependent photocurrent was reported in Bi single thin fi lms. It is proposed that the origin of this photocurrent is the combination of photo-spin conversion and…
Tracing magnetic atom diffusion with annealing at the interface between CoMn alloy and MnGa layer by X-ray magnetic circular dichroism
Jun Okabayashi, Kazuya Z. Suzuki, Shigemi Mizukami
The magnetic atom diffusion at the interface between CoMn alloy and MnGa layer with annealing is studied using x-ray magnetic circular dichroism (XMCD) analysis. We found that the…
Giant effective damping of octupole oscillation in an antiferromagnetic Weyl semimetal
Shinji Miwa, Satoshi Iihama, Takuya Nomoto +8
A magnetic Weyl semimetal is a recent focus of extensive research as it may exhibit large and robust transport phenomena associated with topologically protected Weyl points in mome…
Parity-controlled spin-wave excitations in synthetic antiferromagnets
A. Sud, Y. Koike, S. Iihama +3
We report in this study the current-induced-torque excitation of acoustic and optical modes in Ta/NiFe/Ru/NiFe/Ta synthetic antiferromagnet stacks grown on SiO2/Si substrates. The…
Lattice Softening in Metastable bcc CoxMn100-x(001) Ferromagnetic Layers for a Strain-Less Magnetic Tunnel Junction
Kelvin Elphick, Kenta Yoshida, Tufan Roy +8
In spintronics, one of the long standing questions is why the MgO-based magnetic tunnel junction (MTJ) is almost the only option to achieve a large tunnelling magnetoresistance (TM…
Structural and magnetic properties of epitaxial films of CoIrMnAl equiatomic quaternary Heusler alloy designed from first-principles calculation
Ren Monma, Tufan Roy, Kazuya Suzuki +4
MgO-barrier magnetic tunnel junctions with half-metallic Heusler alloy electrodes attracted much attentions for spintronics applications. However, a couples of issues related to ma…
High tunnel magnetoresistance and magnetism in metastable bcc CoMn-based magnetic tunnel junctions
Kazuma Kunimatsu, Tufan Roy, Jun Okabayashi +7
Co-rich CoMn alloys have hcp or fcc disordered phases and those ferromagnetic orderings are significantly deteriorated with increasing Mn concentration in bulk. On…
Interface-induced field-like optical spin torque in a ferromagnet/heavy metal heterostructure
Satoshi Iihama, Kazuaki Ishibashi, Shigemi Mizukami
The manipulation of magnetization in a metallic ferromagnet by using optical helicity has been much attracted attention for future opto-spintronic devices. The optical helicity ind…
Tunable magnon-magnon coupling in synthetic antiferromagnets
A. Sud, C. W. Zollitsch, A. Kamimaki +5
In this work, we study magnon-magnon coupling in synthetic antiferromagnets (SyAFs) using microwave spectroscopy at room temperature. Two distinct spin-wave modes are clearly obser…
Detecting quadrupole: a hidden source of magnetic anisotropy for Manganese alloys
Jun Okabayashi, Yoshio Miura, Yohei Kota +3
Mn-based alloys exhibit unique properties in the spintronics materials possessing perpendicular magnetic anisotropy (PMA) beyond the Fe and Co-based alloys. It is desired to figure…
Magnetic tunnel junctions with a B2-ordered CoFeCrAl equiatomic Heusler alloy
Tomoki Tsuchiya, Tufan Roy, Kelvin Elphick +8
The equiatomic quaternary Heusler alloy CoFeCrAl is a candidate material for spin-gapless semiconductors (SGSs). However, to date, there have been no experimental attempts at fabri…
Laser-induced antiferromagnetic-like resonance in amorphous ferrimagnets
S. Mizukami, Y. Sasaki, D. -K. Lee +4
The magnetization dynamics for ferrimagnets at the angular momentum compensation temperature T_A is believed to be analogous to that for antiferromagnets. We investigated the pulse…
Laser-induced THz magnetization precession for a tetragonal Heusler-like nearly compensated ferrimagnet
S. Mizukami, A. Sugihara, S. Iihama +3
Laser-induced magnetization precessional dynamics was investigated in epitaxial films of MnGe, which is a tetragonal Heusler-like nearly compensated ferrimagnet. The ferromagne…
Roadmap for Emerging Materials for Spintronic Device Applications
Atsufumi Hirohata, Hiroaki Sukegawa, Hideto Yanagihara +4
The Technical Committee of the IEEE Magnetics Society has selected 7 research topics to develop their roadmaps, where major developments should be listed alongside expected timelin…
Direct measurement of the magnetic anisotropy field in Mn--Ga and Mn--Co--Ga Heusler films
Ciarán Fowley, Siham Ouardi, Takahide Kubota +10
The static and dynamic magnetic properties of tetragonally distorted Mn--Ga based alloys were investigated. Static properties are determined in magnetic fields up to 6.5~T using SQ…
Magnetic dichroism study on MnCoGa thin film using a combination of X-ray absorption and photoemission spectroscopy
Siham Ouardi, Gerhard H. Fecher, Takahide Kubota +4
Using circularly polarised radiation and a combination of bulk-sensitive hard X-ray photoelectron spectroscopy and X-ray-absorption spectroscopy (XAS) we studied the electronic and…
Investigation on MnGa/MgO interface for magnetic tunneling junctions
C. E. ViolBarbosa, S. Ouardi, T. Kubota +6
The MnGa Heusler compound and related alloys are the most promising materials for the realization of spin-transfer-torque switching in magneto tunneling junctions. Improved per…
Magnetic and transport properties of tetragonal- or cubic-Heusler-type Co-substituted Mn-Ga epitaxial thin films
Takahide Kubota, Siham Ouardi, Shigemi Mizukami +4
The composition dependence of the structural, magnetic, and transport properties of epitaxially grown Mn-Co-Ga films were investigated. The crystal structure was observed to change…
Perpendicularly magnetized Mn-Co-Ga-based thin films with high coercive field
Siham Ouardi, Takahide Kubota, Gerhard H. Fecher +5
MnCoGa epitaxial thin films were grown on MgO substrates by magnetron co-sputtering. Structures were tetragonal or cubic depending on Co content. Composition dependen…