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Cyclic resistance change in perpendicularly magnetized Co/Ni nanowire induced by alternating current pulse injection |
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| Authors: | J Kwon S Goolaup FN Tan CH Chang K Roy WS Lew |
| Institution: | 1. School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore;2. School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;3. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA |
| Abstract: | We report on cyclic anisotropic magnetoresistance change induced by current pulse injection in perpendicularly magnetized Co/Ni nanowire. By alternating the polarity of the injection pulse, domain walls (DWs) can be deterministically created and annihilated within the nanowire. The injection induces a combined effect of spin transfer torque and Oersted field that leads to simultaneous creation and driving of DWs in the nanowire. DW created by single pulse injection exhibits a fixed depinning field. For multi-pulse injection, the depinning field increases and this is ascribed to the formation of DWs with opposite chirality. |
| Keywords: | Nanowire Perpendicular magnetic anisotropy DW creation AMR Anomalous Hall effect DW domain wall AMR anisotropic magnetoresistance |
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