Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2006-07-07
Appl. Phys. Lett. 88, 112510 (2006)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
final version to appear in Applied Physics Letters
Scientific paper
10.1063/1.2182021
We studied the interlayer coupling in the quadrilayer consisting of IrMn/CoFe (bottom layer)/NiFeOx/ CoFe (top layer). The in-plane perpendicular interlayer coupling is observed between CoFe layers at room temperature. An anisotropy transition from uniaxial to unidirectional in the perpendicular direction is observed around Tt = 55 K. The nano-oxide layer NiFeOx shows no distinguishable ferromagnetic signal in the high-temperature (uniaxial) phase, while a strong signal appeared in the low-temperature (unidirectional) phase. A possible two-component scenario, that the nano-oxide layer may contain both amorphous short-range antiferromagnetic domains and superparamagneitc clusters, is proposed to explain the phase transition.
Chen Chien-Tsu
Chin Tsung-Shune
Hong Tzay-Ming
Huang Po-Hsiang
Lai Chih-Huang
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