Cyclic resistance change in perpendicularly magnetized Co/Ni nanowire induced by alternating current pulse injection

• Main Authors: Kwon, J., Goolaup, Sarjoosing, Tan, Funan, Chang, Chip Hong, Roy, K., Lew, Wen Siang
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2017
• Subjects: Nanowire; Perpendicular magnetic anisotropy
• Online Access: https://hdl.handle.net/10356/85910; http://hdl.handle.net/10220/43901
• Institution: Nanyang Technological University

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.