A5008948032- Magnetic properties of thin films
- Heusler alloys: electronic and magnetic properties
- Magnetic Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties of Alloys
- Retinal Diseases and Treatments
- ZnO doping and properties
- MXene and MAX Phase Materials
- Retinal and Optic Conditions
- Surface and Thin Film Phenomena
- Theoretical and Computational Physics
- Retinal Development and Disorders
- Retinal and Macular Surgery
- Glaucoma and retinal disorders
- Ocular Diseases and Behçet’s Syndrome
- Quantum and electron transport phenomena
- Characterization and Applications of Magnetic Nanoparticles
- Retinal Imaging and Analysis
- Cerebral Venous Sinus Thrombosis
- Zebrafish Biomedical Research Applications
- Hydrogen Storage and Materials
- Metallic Glasses and Amorphous Alloys
- Multiferroics and related materials
- Advanced Chemical Physics Studies
- Metallurgical and Alloy Processes
Tohoku University
2014-2024
Spintronics Research Network of Japan
2013-2023
Physical Devices (United States)
2012-2020
Advanced Institute of Materials Science
2018
Canadian Nautical Research Society
2018
Keio University
2015
SPring-8 (Japan)
2014
SPring-8
2014
National Institute for Materials Science
2014
Kanazawa University
2006-2012
We have investigated crystalline magnetic anisotropy in the electric field (EF) for Fe-Pt surface which a large perpendicular anisotropy, by means of first-principles approach. The is reduced linearly with respect to inward EF, associated induced spin density around Fe layer. Although energy (MAE) reveals variation atoms, intrinsic contribution MAE found mainly come from
<h3>Aims:</h3> The aim of the study was to assess short-term efficacy intravitreal injections bevacizumab for polypoidal choroidal vasculopathy (PCV). <h3>Methods:</h3> Intravitreal (1 mg) injected into 11 eyes patients with PCV in this retrospective, interventional case series. main outcome measure change vessels on indocyanine green angiography (IA) 3 months after injection. foveal height determined by optical coherence tomography and best-corrected visual acuity (BCVA) also were evaluated...
Abstract Electric fields at interfaces exhibit useful phenomena, such as switching functions in transistors, through electron accumulations and/or electric dipole inductions. We find one potentially unique situation a metal–dielectric interface which the field is atomically inhomogeneous because of strong electrostatic screening effect metals. Such enable us to access quadrupoles shell. Here we show, by synchrotron X-ray absorption spectroscopy, induction magnetic moments platinum monatomic...
The polarization vector of the Rashba spin, which must be parallel to two-dimensional (2D) plane in an ideal system, is found change abruptly and definitely direction perpendicular surface at $\overline{K}$ point Brillouin zone a real hexagonal $\mathrm{Tl}/\mathrm{Si}(111)\mathrm{\text{\ensuremath{-}}}(1\ifmmode\times\else\texttimes\fi{}1)$ surface. This finding obtained experimentally by angle-resolved spin-resolved photoemission measurements fully confirmed first-principles theoretical...
We investigated the origin of perpendicular magneto-crystalline anisotropy (MCA) in L10 ordered FeNi alloy using first-principles density-functional calculations. found that MCA L10-FeNi arises predominantly from constituent Fe atoms, which is consistent with recent measurements orbital magnetic moment by x-ray circular dichroism. Analysis second-order perturbation spin-orbit interaction indicates spin-flip excitations between occupied majority-spin and unoccupied minority-spin bands make a...
Voltage control of spin enables both a zero standby power and ultralow active consumption in spintronic devices, such as magnetoresistive random-access memory devices. A practical approach to achieve voltage is the electrical modulation spin–orbit interaction at interface between 3d-transition-ferromagnetic-metal dielectric layers magnetic tunnel junction (MTJ). However, we need initiate new guideline for materials design improve voltage-controlled anisotropy (VCMA) perpendicular (PMA). Here...
To assess the efficacy and safety of an intravitreal injection bevacizumab (Avastin(R)) for myopic choroidal neovascularisation (mCNV).Intravitreal (1 mg) was injected into eight eyes patients with mCNV in this non-randomised, interventional case series. The best-corrected visual acuity (BCVA) measured optical coherence tomography (OCT) fluorescein angiography findings were examined before after treatment. minimum follow-up time 3 months.The mean BCVA 0.26 treatment 0.51 at last visit (p =...
Tunnel magnetoresistance (TMR) in MgO-based magnetic tunnel junctions (MTJs) with equiatomic quaternary CoFeMnSi Heusler and CoFe alloy electrodes is studied. The epitaxial MTJ stacking structures were prepared using ultrahigh-vacuum magnetron sputtering, where the electrode has a full B2 partial L21 ordering crystal structure. Maximum TMR ratios of 101% 521% observed at room temperature 10 K, respectively, for MTJs. large bias voltage dependence ratio was also low (LT), as similarly Co2MnSi...
We investigated the voltage-controlled magnetic anisotropy (VCMA) in an ultrathin Ir-doped Fe layer with a CoxFe1−x termination layer. The VCMA effect depends on concentration of alloy, and large coefficient, as high −350 fJ/Vm, was obtained Co-rich First principles calculations revealed that increased is due not only to added Co atoms but also Ir adjacent atoms. Interface engineering using CoFe effective for recovering tunneling magnetoresistance while maintaining effect. developed...
In this study, the microscopic origins of voltage-controlled magnetic anisotropy (VCMA) in 3d-ferromagnetic metals are revealed. Using in-situ X-ray fluorescence spectroscopy that provides a high quantum efficiency, electric-field-induced changes orbital moment and dipole Tz terms ultrathin Co films demonstrated. An difference 0.013{\mu}B. was generated presence electric fields +(-)0.2 V/nm. The VCMA properly estimated by induced change moment, according to perturbation theory model. term...
We report an enhancement of the anomalous Nernst effect (ANE) in Ni/Pt (001) epitaxial superlattices. The transport and magneto-thermoelectric properties were investigated for superlattices with various Ni layer thicknesses (${\it t}$). coefficient was increased up to more than 1 ${\mu}$V K$^{-1}$ 2.0 nm ${\leq}$ ${\it t}$ 4.0 nm, which remarkable compared bulk Ni. It has been found that large transverse Peltier (${\alpha}$$_{xy}$), reaching ${\alpha}$$_{xy}$ = 4.8 A m$^{-1}$ plays a prime...
To clarify vascular changes of polypoidal choroidal vasculopathy (PCV) after photodynamic therapy (PDT).Thirty-one eyes underwent PDT with verteporfin and were followed every 3 months indocyanine green angiography (ICGA) using confocal scanning ophthalmoscope optical coherence tomography (OCT) for over 15 the findings recorded.The mean follow-up period was 19.2 months. Regression lesions confirmed once in 29 (94%) on ICGA OCT. Some recurred at initial regions (n = 5 eyes), different...
We study the spin and orbital magnetic moments in Ta/Co0.4Fe0.4B0.2/MgO by x-ray circular dichroism measurements as well first-principles calculations, order to clarify origin of perpendicular anisotropy. Both experimental theoretical results show that moment Fe is more anisotropic than Co with respect magnetization direction. The anisotropy larger for thinner CoFeB, indicating atoms at interface MgO contribute observed
Precise magnetization measurements of a half-metallic ferromagnet ${\mathrm{Co}}_{2}\mathrm{TiSn}$ with the Heusler type structure have been carried out under pressure up to 1.27 GPa. At ambient pressure, spontaneous magnetic moment ${M}_{\mathrm{s}}^{\mathrm{exp}}$ and Curie temperature ${T}_{\mathrm{C}}^{\mathrm{exp}}$ are experimentally obtained be $1.993(3)\phantom{\rule{4pt}{0ex}}{\ensuremath{\mu}}_{\mathrm{B}}$/f.u. $376.76(7)$ K, respectively. The is independent applying pressure....
The magnetic and electronic properties of the layered Zintl-phase compound EuAl$_2$Ge$_2$ crystallizing in trigonal CaAl$_2$Si$_2$-type structure are reported. Our neutron-diffraction measurements show that undergoes A-type antiferromagnetic (AFM) ordering below $T_{\rm N} = 27.5(5)$~K, with Eu moments (Eu$^{2+}$, $S 7/2$) aligned ferromagnetically $ab$ plane. $H 0$ consists AFM domains associated $ab$-plane anisotropy a field-induced reorientation spins is evident at $T 2$~K critical field...
We have investigated the electric field (EF) effect on magnetic anisotropy energy (MAE) in thin films MgO/Fe/M(001) (M = Au and Pt) by means of first-principles density-functional calculations. The EF dependence MAE is enhanced significantly film with Pt substrate compared to that substrate. This enhancement attributed EF-induced hybridization between Fe 3d- 5d-orbitals. implies layer stacked strengthens sensitivity devices for bias-voltage-induced control.
Magnetocrystalline anisotropy (MCA) of Fe(001) interfaces with various non-magnetic metals (Hf, Zr, Ti, Ta, Nb, V, Ir, Rh, Pt, Pd, Au, Ag, Cu, and Zn) was investigated by first-principles calculations. We found that Fe fully occupied d states tend to show perpendicular MCA. The spin-orbit coupling in interfacial atoms plays an important role Conversely, partially exhibit in-plane Hf/Fe(001) interface shows exceptionally large MCA energy 1.5 mJ/m2, which corresponds the MgO/Fe(001) interface....
We investigated the magnetic anisotropy of an iron layer on a Pt(001) surface and some related systems by employing local spin density approximation in theoretical ab initio approach. found that system $\mathrm{Pt}∕\mathrm{Fe}∕\mathrm{Pt}(001)$ showed perpendicular its energy per atom amounted to value which is 2 times larger than bulk FePt. The relaxation much enhances energies, large attractive force between platinum layers. A remarkable cap effect---that covering changes energy---was also...
To assess the effect of cataract on evaluation macular pigment optical density (MPOD) in aged patients.MPOD was prospectively measured using autofluorescence spectrometry before and after surgery. The Lens Opacities Classification System III used to grade cataracts at baseline.Forty-five eyes 41 subjects, who had no ocular disorders or fundus abnormalities except for age-related nuclear cataract, were included. Preoperative MPOD 0.350 ± 0.117 unit (DU). Regression analysis showed that a...
We have investigated the electric field (EF) effect on magnetic anisotropy energy (MAE) in thin films MgO/M/Fe/Au(001) and MgO/Fe/M(001) (M = Pd, Pt, Au) by means of first-principles density-functional calculations. find that MAE varies linearly with EF investigate change slope as a function buffer layer is changed. single monatomic may be useful for devices use EF-modified MAE. simulate critical easy-axis rotation discuss interface effects Mg/Fe Fe/Au
Magnetic materials with low Gilbert damping and magnetization are necessary for the realization of faster or more energy-efficient spintronic devices based on spin-transfer-torque. Here, we report in epitaxially grown equiatomic quaternary CoFeMnSi Heusler alloy films. The 10 nm-thick films show a saturation M S = 630 emu cm−3 constant , which relatively small values among transition metal ferromagnets, addition to its soft magnetic properties. physical origin possibility further reduction α...
We studied magnetic tunnel junctions (MTJs) with a MgO(001) barrier and metastable bcc Co3Mn(001) disordered alloy electrodes. A magnetoresistance (TMR) ratio was approximately 200%–250% observed at room temperature. successfully the TMR greater than 600% 10 K which higher past reported value of MgO-based MTJs ultrathin Co(001) However, our experimental still much lower theoretical prediction in Co/MgO/Co(001) MTJs. discuss some differences bulk band structure affecting effect for Co Co3Mn.