Exchange Bias in NiCo/FeMn Bilayers with Stripe Domains
LIN Jing1, SHI Zhong1, ZHOU Shi-Ming1, ZHANG Xia2, XIA Yun-Jie2
1Surface Physics Laboratory and Department of Physics, Fudan University, Shanghai 2004332Shandong Province Key Lab Laser Polarization and Information, Qufu Normal University, Qufu 273165
Exchange Bias in NiCo/FeMn Bilayers with Stripe Domains
LIN Jing1, SHI Zhong1, ZHOU Shi-Ming1, ZHANG Xia2, XIA Yun-Jie2
1Surface Physics Laboratory and Department of Physics, Fudan University, Shanghai 2004332Shandong Province Key Lab Laser Polarization and Information, Qufu Normal University, Qufu 273165
摘要Exchange bias in NiCo/FeMn bilayers is established by alternating current (magnetic) field cooling, and stripe domains are induced as manifested by the ``double'' hysteresis loop. Only one resonance peak occurs at high magnetic fields in the in-plane ferromagnetic resonance spectra. The exchange field measured by both the magnetometry and ferromagnetic resonances is inversely proportional to the ferromagnetic layer thickness tFM. More remarkably, the exchange field determined by the ferromagnetic resonance is smaller than that of the magnetometry measurements. It is suggested to arise from the misalignment of the unidirectional anisotropic directions in neighboring domains.
Abstract：Exchange bias in NiCo/FeMn bilayers is established by alternating current (magnetic) field cooling, and stripe domains are induced as manifested by the ``double'' hysteresis loop. Only one resonance peak occurs at high magnetic fields in the in-plane ferromagnetic resonance spectra. The exchange field measured by both the magnetometry and ferromagnetic resonances is inversely proportional to the ferromagnetic layer thickness tFM. More remarkably, the exchange field determined by the ferromagnetic resonance is smaller than that of the magnetometry measurements. It is suggested to arise from the misalignment of the unidirectional anisotropic directions in neighboring domains.
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2009, Vol. 26 
