Thermoelectrical manipulation of nanomagnets

Kadigrobov, Anatoli and Andersson, Sebastian and Radić, Danko and Shekhter, Robert and Jonson, Mats and Korenivski, Vladislav (2010) Thermoelectrical manipulation of nanomagnets. Journal of Applied Physics, 107. pp. 123706-9. ISSN 0021-8979

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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.

Item Type: Article
Keywords: exchange-spring, Curie temperature, ferromagnetic materials, ferromagnetic-paramagnetic transitions, magnetic multilayers, magnetoresistance, nanomagnetics, GMR, self-excited oscillations
Date: 2010
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2010) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1023
Publisher: American Institute of Physics
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 03 Jul 2014 14:31
Last Modified: 24 Feb 2016 15:40

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