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Heinen Jan,Schulz Tomek,Kl¨aui Mathias,Boulle Olivier,Malinowski Gregory,Swagten Henk,Koopmans Bert,Ulysse Christian,Faini Giancarlo,Ocker Berthold,Wrona Jerzy,Ahn Sung-Min,Nguyen Ngoc-Minh,Ravelosona 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
We determine in high anisotropy Pt/Co- and Ni/Co-based multilayer materials, which are candidates for high density storage applications, the contributions to the extraordinary Hall effect. In order to gain more insight into the physics underlying these processes, the dependence of the extraordinary Hall resistivity on the longitudinal resistivity is used to identify the skew scattering and the combined intrinsic and side jump effects when analyzing their variation with temperature. Furthermore, the influence of an additional amorphous CoFeB layer is shown, revealing a possibility to enhance the extraordinary Hall effect using this material.
Mathias Klaui,Dennis Ilgaz,Lutz Heyne,June-Seo Kim,Olivier Boulle,Christine Schieback,Fabian Zinser,Stephen Krzyk,Mikhail Fonin,Ulrich Rudiger,Dirk Backes,Laura J. Heyderman,T. O. Mentes,A. Locatelli 한국자기학회 2009 Journal of Magnetics Vol.14 No.2
Herein, different concepts for domain wall propagation based on currents and fields that could potentially be used in magnetic data storage devices based on domains and domain walls are reviewed. By direct imaging, we show that vortex and transverse walls can be displaced using currents due to the spin transfer torque effect. For the case of field-induced wall motion, particular attention is paid to the influence of localized fields and local heating on the depinning and propagation of domain walls. Using an Au nanowire adjacent to a permalloy structure with a domain wall, the depinning field of the wall, when current pulses are injected into the Au nanowire, was studied. The current pulse drastically modified the depinning field, which depended on the interplay between the externally applied field direction and polarity of the current, leading subsequently to an Oersted field and heating of the permalloy at the interface with the Au wire. Placing the domain wall at various distances from the Au wire and studying different wall propagation directions, the range of Joule heating and Oersted field was determined; both effects could be separated. Approaches beyond conventional field- and current-induced wall displacement are briefly discussed.