Magnetic hysteresis of individual Janus particles with hemispherical exchange biased caps

Philipp, S. and Gross, B. and Reginka, M. and Merkel, M. and Claus, M. M. and Sulliger, M. and Ehresmann, A. and Poggio, M.. (2021) Magnetic hysteresis of individual Janus particles with hemispherical exchange biased caps. Applied Physics Letters, 119 (22). p. 222406.

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We use sensitive dynamic cantilever magnetometry to measure the magnetic hysteresis of individual magnetic Janus particles. These particles consist of hemispherical caps of magnetic material deposited on micrometer-scale silica spheres. The measurements, combined with corresponding micromagnetic simulations, reveal the magnetic configurations present in these individual curved magnets. In remanence, ferromagnetic Janus particles are found to host a global vortex state with vanishing magnetic moment. In contrast, a remanent onion state with significant moment is recovered by imposing an exchange bias to the system via an additional antiferromagnetic layer in the cap. A robust remanent magnetic moment is crucial for most applications of magnetic Janus particles, in which an external magnetic field actuates their motion.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanotechnologie Argovia (Poggio)
UniBasel Contributors:Philipp, Simon and Gross, Boris André and Claus, Mathias and Sulliger, Marc and Poggio, Martino
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:AIP Publishing
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:12 Apr 2022 07:29
Deposited On:12 Apr 2022 07:29

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