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Chiral anisotropic magnetoresistance of ferromagnetic helices

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Maurenbrecher H., Mendil J., Chatzipirpiridis G., Mattmann M., Pane S., Nelson B. J., Gambardella P.,
Project Spin-orbitronics in ferromagnets and antiferromagnets
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Original article (peer-reviewed)

Journal Applied Physics Letters
Volume (Issue) 112(24)
Page(s) 242401 - 242401
ISBN 0003-6951
Title of proceedings Applied Physics Letters
DOI 10.1063/1.5027660

Open Access

URL https://arxiv.org/abs/1904.11049
Type of Open Access Repository (Green Open Access)

Abstract

We investigate the anisotropic magnetoresistance (AMR) of ferromagnetic CoNi microhelices fabricated by electrodeposition and laser printing. We find that the geometry of the three-dimensional winding determines a characteristic angular and field-dependence of the AMR due to the competition between helical shape anisotropy and an external magnetic field. Moreover, we show that there is an additional contribution to the AMR that scales proportionally to the applied current and depends on the helical chirality. We attribute this contribution to the self-magnetic field induced by the current, which modifies the orientation of the magnetization relative to the current flow along the helix. Our results underline the interest of three-dimensional curved geometries to tune the AMR and realize tubular magnetoresistive devices. Published by AIP Publishing.
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