Thermoelectrical manipulation of nanomagnets

A. M. Kadigrobov, S. Andersson, D. Radić, R. I. Shekhter, M. Jonson, V. Korenivski

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Abstract

We investigate the interplay between the thermodynamic properties and spin-dependent transport in a mesoscopic device based on a magnetic multilayer (F/f/F), in which two strongly ferromagnetic layers (F) are exchange-coupled through a weakly ferromagnetic spacer (f) with the Curie temperature in the vicinity of room temperature. We show theoretically that the Joule heating produced by the spin-dependent current allows a spin-thermoelectronic control of the ferromagnetic-to-paramagnetic (f/N) transition in the spacer and, thereby, of the relative orientation of the outer F-layers in the device (spin-thermoelectric manipulation of nanomagnets). Supporting experimental evidence of such thermally-controlled switching from parallel to antiparallel magnetization orientations in F/f(N)/F sandwiches is presented. Furthermore, we show theoretically that local Joule heating due to a high concentration of current in a magnetic point contact or a nanopillar can be used to reversibly drive the weakly ferromagnetic spacer through its Curie point and thereby exchange couple and decouple the two strongly ferromagnetic F-layers. For the devices designed to have an antiparallel ground state above the Curie point of the spacer, the associated spin-thermionic parallel to antiparallel switching causes magnetoresistance oscillations whose frequency can be controlled by proper biasing from essentially dc to GHz. We discuss in detail an experimental realization of a device that can operate as a thermomagnetoresistive switch or oscillator. © 2010 American Institute of Physics.

Original languageEnglish
Article number123706
JournalJournal of Applied Physics
Volume107
Issue number12
DOIs
Publication statusPublished - 15 Jun 2010

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    Kadigrobov, A. M., Andersson, S., Radić, D., Shekhter, R. I., Jonson, M., & Korenivski, V. (2010). Thermoelectrical manipulation of nanomagnets. Journal of Applied Physics, 107(12), [123706]. https://doi.org/10.1063/1.3437054