Tracing magnetic atom diffusion with annealing at the interface between CoMn alloy and MnGa layer by X-ray magnetic circular dichroism

Okabayashi, Jun*; Suzuki, Kazuya; Mizukami, Shigemi*

Journal of Magnetism and Magnetic Materials, 564, Part2, p.170163_1 - 170163_5, 2022/12

https://doi.org/10.1016/j.jmmm.2022.170163

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 perpendicularly magnetized MnGa layer under the as-grown conditions, while the post annealing modulates the interfacial magnetic coupling to antiferromagnetic in Co. The elementspecific hysteresis curves at each absorption edge revealed the large coercive fields in Mn and Co through the exchange coupling with MnGa. After the annealing process, the changes of XMCD spectral line shapes are related to the interfacial reactions promoting the formation of Mn and CoMnGa layers, which is deduced from the analysis oftransmission electron microscopy. The interfacial diffusion of Mn atoms modulates the magnetic exchange coupling between Mn and Co sites and reverses the direction of perpendicular magnetization.

Effects of swift heavy ion irradiation on magnetic properties of Fe-Rh alloy

Fukuzumi, Masafumi*; Chimi, Yasuhiro; Ishikawa, Norito; Suzuki, Motohiro*; Takagaki, Masafumi*; Mizuki, Junichiro; Ono, Fumihisa*; Neumann, R.*; Iwase, Akihiro*

Nuclear Instruments and Methods in Physics Research B, 245(1), p.161 - 165, 2006/04

https://doi.org/10.1016/j.nimb.2005.11.094

We have performed swift heavy ion irradiations in Fe-50at.%Rh alloys at room temperature. Before and after the irradiations, the magnetic properties and the lattice structure are measured using Superconducting QUantum Interference Device (SQUID) and X-Ray Diffractometer (XRD), respectively. We have also performed X-ray Magnetic Circular Dichroism (XMCD) measurement near the Fe K-edge at the synchrotron radiation facility, SPring-8, to examine the irradiation-induced ferromagnetic state near the specimen surface. We have found that the swift heavy ion irradiations induce the ferromagnetic state in Fe-50at.%Rh alloy below the antiferromagnetism-ferromagnetism transition temperature of the unirradiated alloy and the lattice expasion by 0.3%. For the specimens irradiated with swift heavy ions, we observe the XMCD spectra correponding to ferromagnetisim, which depend on the mass of irradiating ions and/or irradiation fluence. Effects of energy loss through electronic excitation and elastic collisions on lattice and magnetic structures of Fe-Rh alloy are discussed.

Admixture of excited states and ground states of a Eu ion in EuFeO by means of magnetic circular dichroism

Mizumaki, Masaichiro*; Uozumi, Takayuki*; Agui, Akane; Kawamura, Naomi*; Nakazawa, Makoto*

Physical Review B, 71(13), p.134416_1 - 134416_8, 2005/04

https://doi.org/10.1103/PhysRevB.71.134416

no abstracts in English

Investigation of perpendicular magnetic films by means of soft X-ray spectroscopy; [Co/Pd] multilayered films and RE-TM amorphous films

Agui, Akane; Mizumaki, Masaichiro*

Shingaku Giho, 104(409), p.7 - 10, 2004/11

no abstracts in English

New numerical method for the solutions of the MCDF equations based on the CIP method

Utsumi, Takayuki*; Koga, J. K.

Computer Physics Communications, 148(3), p.281 - 290, 2002/11

https://doi.org/10.1016/S0010-4655(02)00597-0

no abstracts in English

First operation of circular dichroism measurements with periodic photon-helicity switching by a variably polarizing undulator at BL23SU at SPring-8

Agui, Akane; Yoshigoe, Akitaka; Nakatani, Takeshi*; Matsushita, Tomohiro*; Saito, Yuji; Yokoya, Akinari; Tanaka, Hitoshi*; Miyahara, Yoshikazu*; Shimada, Taihei; Takeuchi, Masao*; et al.

Review of Scientific Instruments, 72(8), p.3191 - 3197, 2001/08

https://doi.org/10.1063/1.1382635

no abstracts in English

First-principles calculations of Magnetic Circular Dichroism spectra of nonmagnetic elements in ferromagnetic ordered alloys

Yamaguchi, Masatake; Asano, S.*

Nihon Oyo Jiki Gakkai-Shi, 25(4-Part2), p.659 - 662, 2001/04

no abstracts in English

DANKE: A Monte Carlo computer program for calculating the Dancoff correction factor for spheres, rods and slabs

Okuno, Hiroshi; Komuro, Yuichi

JAERI-M 94-049, 28 Pages, 1994/03

JAERI-M-94-049.pdf:0.55MB

no abstracts in English

Basic study of the development of adsorptive separation technique for nuclear species in treated water using the silica-supported amphoteric ion exchanger

Komada, Ryo*; Yoshikawa, Yuta*; Arai, Tsuyoshi*; Sato, Fuminori; Kojima, Junji

no journal, , 

no abstracts in English