A Material View on Extrinsic Magnetic Domain Wall Pinning in Cylindrical CoNi Nanowires

Schöbitz M, Novotný O, Trapp B, Bochmann S, Cagnon L, Thirion C, Massebœuf A, Mossang E, Fruchart O, Bachmann J (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Journal of Physical Chemistry C American Chemical Society

Book Volume: 127

Pages Range: 2387-2397

Journal Issue: 5

DOI: 10.1021/acs.jpcc.2c07687

Abstract

Speed and reliability of magnetic domain wall (DW) motion are key parameters that must be controlled to realize the full potential of DW-based magnetic devices for logic and memory applications. A major hindrance to this is extrinsic DW pinning at specific sites related to shape and material defects, which may be present even if the sample synthesis is well controlled. Understanding the origin of DW pinning and reducing it are especially desirable in electrochemically deposited cylindrical magnetic nanowires (NWs), for which measurements of the fascinating physics predicted by theoretical computation have been inhibited by significant pinning. We experimentally investigate DW pinning in CoxNi100-x NWs by applying quasi-static magnetic fields. Wire compositions were varied with x = 20, 30, and 40, while the microstructure was changed by annealing or by varying the pH of the electrolyte for deposition. We conclude that pinning due to grain boundaries is the dominant mechanism, decreasing inversely with both the spontaneous magnetization and grain size. Second-order effects include inhomogeneities in lattice strain and the residual magnetocrystalline anisotropy. Surface roughness, dislocations, and impurities are not expected to play a significant role in DW pinning in these wire samples.

Authors with CRIS profile

Sebastian Bochmann Lehrstuhl für Chemistry of thin film materials Julien Bachmann Lehrstuhl für Chemistry of thin film materials

Involved external institutions

Spin in electronics Research / Spintronique et Technologie des Composants (SPINTEC) FR France (FR) University of Grenoble Alpes (UGA) / Université de Grenoble FR France (FR)

How to cite

APA:

Schöbitz, M., Novotný, O., Trapp, B., Bochmann, S., Cagnon, L., Thirion, C.,... Bachmann, J. (2023). A Material View on Extrinsic Magnetic Domain Wall Pinning in Cylindrical CoNi Nanowires. Journal of Physical Chemistry C, 127(5), 2387-2397. https://dx.doi.org/10.1021/acs.jpcc.2c07687

MLA:

Schöbitz, Michael, et al. "A Material View on Extrinsic Magnetic Domain Wall Pinning in Cylindrical CoNi Nanowires." Journal of Physical Chemistry C 127.5 (2023): 2387-2397.

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