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반강자성 IrMn 층과 인접한 Co/Ni 다층박막의 수직 교환 바이어스
류광수(Kwang-Su Ryu),양시훈(See-Hun Yang) 한국자기학회 2017 韓國磁氣學會誌 Vol.27 No.6
We report the experimental observation of the perpendicular exchange bias effect in the ferromagnetic CoNi multilayers interfacing with antiferromagnetic IrMn layer. From a hysteresis loop measurement, it was found that as the antiferromagnetic IrMn thickness increases from 5 Å to 40 Å, the hysteresis loop is gradually changed from the symmetric shape to the asymmetric shape shifted by some amount corresponding to the exchange-biased field at the thickness of 20 Å. Also, the domain observation experiment shows that the domain reversals in the increasing and decreasing field regions at the sample with the thickness of 40 Å exhibit the same single domain wall motion even though they have the different coercivities.
IrMn 층과 인접한 Co/Ni 다층박막에서 자구벽 Creep 운동의 관찰
김종인(Jong-In Kim),류광수(Kwang-Su Ryu),양시훈(See-Hun Yang) 한국자기학회 2020 韓國磁氣學會誌 Vol.30 No.6
We report the experimental observation of the domain wall creep motion in the ferromagnetic CoNi multilayers interfacing with antiferromagnetic IrMn layer, using a magento-optical Kerr microscope system capable of direct observation of domain change. From the magnetic domain images observed in real time, it can be seen that as the IrMn thickness increases from 0 Å to 25 Å, the strength of the magnetic field required to move the magnetic domain wall gradually increases, due to an increase in coercivity due to the exchange bias effect at the interface. In addition, it was found that the magnetic domain wall velocity characteristics according to the magnetic field in all samples were well explained by the thermal activated model assuming the domain wall creep motion.
IrMn 층이 있거나 없는 Co/Ni/Co 자성 와이어의 자기장 하에서 자구벽 Creep 운동의 관찰
윤세환(Se-Hwan Yoon),류광수(Kwang-Su Ryu),양시훈(See-Hun Yang) 한국자기학회 2022 韓國磁氣學會誌 Vol.32 No.1
In this study, we experimentally observed the domain wall creep motions under the magnetic field in the ferromagnetic Co/Ni/Co magnetic wires with or without antiferromagnetic IrMn layer, respectively, using a magento-optical Kerr microscope system capable of real-time magnetic domain observation. As a result of the observation, it was found that the strength of the magnetic field required to move the magnetic domain wall was larger in the sample with the IrMn layer than the sample without the IrMn layer, and also, it was increased as the wire width decreased. In addition, we found that the magnetic domain wall speed characteristics according to the strength of the magnetic field in the two samples were well explained by the thermally activated model assuming the domain wall creep motion.