강자성 공명법을 이용한 CoFe/MnIr 박막의 교환 결합 에너지 분석

다국어 초록 (Multilingual Abstract)

We measure the ferromagnetic resonance signals in order to analyze the exchange coupling energy due to the uncompensated antiferromagnetic spins in exchange coupled CoFe/MnIr bilayers. The exchange bias fields (H_ex) and rotatable anisotropy fields (H_ra) are obtained from the ferromagnetic resonance fields measured with in-plane angle in thermal annealed samples with t_AF= 0, 3, and 10 nm. The sum of the H_ex and H_ra do not depend on the MnIr thickness, which means that all the uncompensated AF spins are aligned to one direction in 300 ℃ annealed samples. Therefore, the uncompensated AF spins are divided into two different parts. One parts are fixed at the interface between CoFe/MnIr bilayers and induces the H_ex, other parts are rotatable with magnetic field and induces the H_ra. Finally, the exchange coupling energy can be expressed by the sum of the exchange bias energy and rotatable anisotropy energy.

참고문헌 (Reference)

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