Exchange bias dependence on interface spin alignment in a Ni80Fe20/(Ni,Fe)O thin film.
A Ni80Fe20/(Ni,Fe)O thin film exhibits a positive exchange bias when cooled in a zero field and a negative exchange bias when field cooled. With transmission electron microscopy and electron energy loss spectrometry, the composition and magnetic structure has been ascertained and a distribution of magnetization easy axes about the interface extrapolated. The results indicate that the positive exchange bias is from antiferromagnetic interface moments perpendicular to their ferromagnetic counterparts. With field cooling the alignment is put into a parallel configuration resulting in a negative exchange bias.
Ouyang
H
H
Department of Materials Engineering, National Chung Hsing University, Taichung 402, Taiwan, Republic of China.
Lin
K-W
KW
Liu
C-C
CC
Lo
Shen-Chuan
SC
Tzeng
Y-M
YM
Guo
Z-Y
ZY
van Lierop
J
J