Jun Okabayashi
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View article: Large perpendicular magnetic anisotropy at Fe/rock-salt-type Cr-oxide interface synthesized via oxygen-driven chemical layer exchange process
Large perpendicular magnetic anisotropy at Fe/rock-salt-type Cr-oxide interface synthesized via oxygen-driven chemical layer exchange process Open
Perpendicular magnetic anisotropy (PMA) induced at the interface of the metallic magnetic layer/oxide layer plays a major role in scaling of state-of-the-art spin-transfer-torque magnetoresistive random access memory. The realization of PM…
View article: Strain-induced specific orbital control in a Heusler alloy-based interfacial multiferroics
Strain-induced specific orbital control in a Heusler alloy-based interfacial multiferroics Open
For the development of spintronic devices, the control of magnetization by a low electric field is necessary. The microscopic origin of manipulating spins relies on the control of orbital magnetic moments ( m orb ) by strain; this is essen…
View article: Intrinsic Magnetic Proximity Effect at the Atomically Sharp Interface of Co<i><sub>x</sub></i>Fe<sub>3–<i>x</i></sub>O<sub>4</sub>/Pt Grown by Molecular Beam Epitaxy
Intrinsic Magnetic Proximity Effect at the Atomically Sharp Interface of Co<i><sub>x</sub></i>Fe<sub>3–<i>x</i></sub>O<sub>4</sub>/Pt Grown by Molecular Beam Epitaxy Open
CoxFe3-xO4(CFO)/Pt bilayers prepared by molecular beam epitaxy were investigated for the anomalous Hall effect and X-ray magnetic circular dichroism (XMCD). We found that the anomalous Hall effect originates from a magnetic proximity effec…
View article: Understanding voltage-controlled magnetic anisotropy effect at Co/oxide interface
Understanding voltage-controlled magnetic anisotropy effect at Co/oxide interface Open
The voltage-controlled magnetic anisotropy (VCMA) effect is a key to realising high-speed, ultralow-power consumption spintronic devices. The fcc-Co-(111)-based stack is a promising candidate for the achievement of large VCMA coefficients.…
View article: Perpendicular magnetic anisotropy of an ultrathin Fe layer grown on NiO(001)
Perpendicular magnetic anisotropy of an ultrathin Fe layer grown on NiO(001) Open
The magnetic anisotropy and magnetic interactions at the interface between Fe and NiO(001) were investigated. Depending on the growth conditions of the NiO(001) layers and the post-annealing temperature, the preferential magnetization dire…
View article: Control of conductivity in Fe-rich cobalt-ferrite thin films with perpendicular magnetic anisotropy
Control of conductivity in Fe-rich cobalt-ferrite thin films with perpendicular magnetic anisotropy Open
We fabricated two types of cobalt-ferrite (001) thin films, insulative Fe-rich cobalt-ferrite CoxFe3-xO4+δ (I-CFO) and conductive Fe-rich cobalt-ferrite CoyFe3-yO4 (C-CFO), with perpendicular magnetic anisotropy (PMA) on MgO (001) substrat…
View article: Tracing magnetic atom diffusion with annealing at the interface between CoMn alloy and MnGa layer by X-ray magnetic circular dichroism
Tracing magnetic atom diffusion with annealing at the interface between CoMn alloy and MnGa layer by X-ray magnetic circular dichroism Open
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 spins in bcc CoMn are coupled parallel to those in perpendi…
View article: Understanding magnetocrystalline anisotropy based on orbital and quadrupole moments
Understanding magnetocrystalline anisotropy based on orbital and quadrupole moments Open
Understanding magnetocrystalline anisotropy (MCA) is fundamentally important for developing novel magnetic materials. Therefore, clarifying the relationship between MCA and local physical quantities observed by spectroscopic measurements, …
View article: Understanding magnetocrystalline anisotropy based on orbital and quadrupole moments
Understanding magnetocrystalline anisotropy based on orbital and quadrupole moments Open
Understanding magnetocrystalline anisotropy (MCA) is fundamentally important for developing novel magnetic materials. Therefore, clarifying the relationship between MCA and local physical quantities observed by spectroscopic measurements, …
View article: Origin of Perpendicular Magnetic Anisotropy in Co$_x$Fe$_{3-x}$O$_{4+\delta}$ Thin Films Studied by X-ray Magnetic Circular and Linear Dichroisms
Origin of Perpendicular Magnetic Anisotropy in Co$_x$Fe$_{3-x}$O$_{4+\delta}$ Thin Films Studied by X-ray Magnetic Circular and Linear Dichroisms Open
We investigate the element-specific spin and orbital states and their roles on magnetic anisotropy in the Co-ferrite (Co$_x$Fe$_{3-x}$O$_{4+\delta}$ (001)) thin films which exhibit perpendicular magnetic anisotropy (PMA). The origin of PMA…
View article: Manipulation of Perpendicular Magnetic Anisotropy by Interfacial Strain: Development of Orbital Elastic Effect by Electric-Field Induced XMCD
Manipulation of Perpendicular Magnetic Anisotropy by Interfacial Strain: Development of Orbital Elastic Effect by Electric-Field Induced XMCD Open
Controlling magnetic anisotropy by orbital magnetic moments related to interfacial strains has considerable potential for the development of future devices using spins and orbitals. In this study, we developed an electric-field (E)-induced…
View article: Perpendicular magnetic anisotropy at the Fe/Au(111) interface studied by Mössbauer, x-ray absorption, and photoemission spectroscopies
Perpendicular magnetic anisotropy at the Fe/Au(111) interface studied by Mössbauer, x-ray absorption, and photoemission spectroscopies Open
The origin of the interfacial perpendicular magnetic anisotropy (PMA) induced\nin the ultrathin Fe layer on the Au(111) surface was examined using\nsynchrotron-radiation-based M\\"{o}ssbauer spectroscopy (MS), X-ray magnetic\ncircular dich…
View article: High tunnel magnetoresistance and magnetism in metastable bcc Co$_{1-x}$Mn$_x$-based magnetic tunnel junctions
High tunnel magnetoresistance and magnetism in metastable bcc Co$_{1-x}$Mn$_x$-based magnetic tunnel junctions Open
Co-rich Co$_{1-x}$Mn$_x$ alloys have hcp or fcc disordered phases and those ferromagnetic orderings are significantly deteriorated with increasing Mn concentration $x$ in bulk. On the other hand, those metastable bcc phases show properties…
View article: CCDC 1987734: Experimental Crystal Structure Determination
CCDC 1987734: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …