TY - JOUR
T1 - Effect of chemical ordering on 90°interlayer coupling in epitaxial Co-Fe/Cr/Co-Fe thin films
AU - Bosu, S.
AU - Sakuraba, Y.
AU - Saito, K.
AU - Izumi, K.
AU - Koganezawa, T.
AU - Takanashi, K.
N1 - Funding Information:
This work was a part of the cooperative research program of the Advanced Research Center of Metallic Glasses, Institute for Materials Research, Tohoku University. The authors acknowledge the financial support by the Grant-in-Aid for scientific Research in Priority Area “Creation and control of spin current ” (Grant no. 19048004 ), and Young Scientists (B) (Grant no. 20760005 ) by MEXT, Japan. This work was also supported in part by Global COE Program “Materials Integration (International Center of Education and Research), Tohoku University,” MEXT, Japan. The authors would like to thanks J. Inoue, Nagoya University, Japan for the theoretical support and valuable discussion, and H. Wang, Capital Norma University, China for the support with the numerical simulations program.
PY - 2014/11
Y1 - 2014/11
N2 - Interlayer exchange coupling (IEC) was studied in ferromagnetic binary alloy Co-Fe thin films through Cr spacer to investigate systematically, the effects of chemical compositions and the chemical ordering on the observation of 90° interlayer coupling in magnetic alloy based structures. The dominating 180° coupling with weak 90° coupling was observed at room temperature deposited CoxFe1-x/Cr/CoxFe1-x (x=0 to 0.8) trilayer samples for all values of x. However, the strength of the 90° coupling for x=0.4 and 0.5 was found to increase with increasing the annealing temperature, Tann for the bottom CoxFe 1-x layer and the strength of 90° coupling became comparable to that of 180° coupling at Tann=400 °C. The enhancement of 90° coupling was considered to be originated from the unconventional interfacial magnetic exchange interactions between Cr and Co (and Fe) due to the appearance of antiphase structures at the interface with the enhancement of chemical ordering (B2 ordering) which was confirmed by synchrotron X-ray diffraction.
AB - Interlayer exchange coupling (IEC) was studied in ferromagnetic binary alloy Co-Fe thin films through Cr spacer to investigate systematically, the effects of chemical compositions and the chemical ordering on the observation of 90° interlayer coupling in magnetic alloy based structures. The dominating 180° coupling with weak 90° coupling was observed at room temperature deposited CoxFe1-x/Cr/CoxFe1-x (x=0 to 0.8) trilayer samples for all values of x. However, the strength of the 90° coupling for x=0.4 and 0.5 was found to increase with increasing the annealing temperature, Tann for the bottom CoxFe 1-x layer and the strength of 90° coupling became comparable to that of 180° coupling at Tann=400 °C. The enhancement of 90° coupling was considered to be originated from the unconventional interfacial magnetic exchange interactions between Cr and Co (and Fe) due to the appearance of antiphase structures at the interface with the enhancement of chemical ordering (B2 ordering) which was confirmed by synchrotron X-ray diffraction.
KW - B2 ordering
KW - Binary alloy Co-Fe
KW - Interlayer exchange coupling
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U2 - 10.1016/j.jmmm.2014.06.044
DO - 10.1016/j.jmmm.2014.06.044
M3 - Article
AN - SCOPUS:84903977923
SN - 0304-8853
VL - 369
SP - 211
EP - 218
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
ER -