journal article·2016-12-01Open access

Stochastic domain wall depinning in permalloy nanowires with various types of notches

Y. Gao, B. You, H. L. Yang, Q. F. Zhan, Z. Li, N. Lei, W. S. Zhao, J. Wu, H. Q. Tu, J. Wang, L. J. Wei, W. Zhang, Y. B. Xu, J. Du

AIP Advances· Volume 6· Issue 12

Abstract

Stochastic phenomena in magnetic nanowires based on domain wall (DW) motion is scientifically important thus to understand and control such behaviors are very meaningful. Here we report on the investigation of pinning and depinning of DWs in permalloy nanowires with six types of longitudinally asymmetric notches using focused magneto-optic Kerr effect (FMOKE) magnetometer and magnetic force microscopy (MFM). The hysteresis loops obtained by FMOKE indicate the generation of one or two distinct depinning fields by creating one notch close to the edge of the nanowires, in comparison multiple depinning processes occur in the nanowires with two identical notches symmetrically placed along the transverse direction, indicating more remarkable stochastic DW depinning phenomena. The MFM images verify the existence of DW in each type of nanowires and the DW sizes in the latter kind of nanowires are generally larger than those in the former ones. These observations can be explained by considering the thermal perturbation and edge or surface roughness effects in nanowires.
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Research context

OpenAlex topics: Magnetic properties of thin films · Magnetic Properties and Applications · Theoretical and Computational Physics

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Affiliations

Nanjing University 1 National Laboratory of Solid State Microstructures and Department of Physics, , Nanjing 210093, People’s Republic of China

2Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, People’s Republic of China

Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences 3 Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, , Ningbo, Zhejiang 315201, People’s Republic of China

Beihang University 4 Fert Beijing Institute, , Beijing, People’s Republic of China

Beihang University 5 School of Electronic and Information Engineering, , Beijing, China

University of York 6 Department of Physics, , York YO10 5DD, United Kingdom

Nanjing University 7 School of Electronic Science and Engineering, , Nanjing 210046, People’s Republic of China

Funding

National Basic Research Program of China · National Key Research and Development Program of China

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