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오늘 본 자료
Effect of microstructures on the Gilbert damping in Co/Ni multilayers
송현석,이경동,양시훈,손정우,김현중,유천열,박병국,Stuart Parkin,신성철,홍정일 한국물리학회 2016 Current Applied Physics Vol.16 No.10
Proper understanding of spin dynamics in the magnetic multilayer system is a necessary step for the fabrication of practical magnetic devices. In the present study, spin dynamics in the [Co/Ni]N/Ti multilayers at various Co and Ni layer thicknesses were obtained by optical method with the aim to identify the structural effects on the Gilbert damping constant of the multilayer system. It was found that the change of crystallinity and magnetocrystalline anisotropy depending on the relative thicknesses ratio of Co and Ni layers work as the main factor to determine the Gilbert damping behavior.
Synthetic antiferromagnetic spintronics
Duine, R. A.,Lee, Kyung-Jin,Parkin, Stuart S. P.,Stiles, M. D. Nature Publishing Group UK 2018 NATURE PHYSICS Vol.14 No.3
<P>Spintronic and nanomagnetic devices often derive their functionality from layers of different materials and the interfaces between them. We discuss the opportunities that arise from synthetic antiferromagnets consisting of two or more ferromagnetic layers that are separated by metallic spacers or tunnel barriers and have antiparallel magnetizations.</P>
Ryu, Kwang-Su,Yang, See-Hun,Thomas, Luc,Parkin, Stuart IOP Publishing 2016 Japanese journal of applied physics Vol.55 No.9
<P>We have studied the current-induced domain wall (CIDW) dynamics in perpendicularly magnetized Co/Ni multilayers deposited on Au underlayer, where the conventional spin transfer torque governs the domain wall dynamics, by the Kerr microscope. It is found that the DW angle tilting following Oersted field profile plays an important role in domain wall (DW) motion at high current density J by decreasing DW velocity with the increasing J, while distorting its DW morphology. Also we find that the DW pinning becomes pronounced as the anisotropy decreases by increasing number of Co/Ni repeats. Most remarkably, the DW tilting angle changes its sign by inserting ultrathin Pt layer between Au and Co layer, which suggests that the Dzyaloshinskii-Moriya interaction and spin Hall effect induces opposite effect in DW tilting. Our findings can be of use for application of CIDW to spintronics with perpendicularly magnetized systems. (C) 2016 The Japan Society of Applied Physics</P>