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Thermoelectrical manipulation of nanomagnets

Artikel i vetenskaplig tidskrift
Författare Anatoli M. Kadigrobov
S Andersson
Danko Radic
Robert I. Shekhter
Mats Jonson
V. Korenivski
Publicerad i Journal of Applied Physics
Volym 107
Nummer/häfte 12
Sidor 123706
ISSN 0021-8979
Publiceringsår 2010
Publicerad vid Institutionen för fysik (GU)
Sidor 123706
Språk en
Länkar dx.doi.org/10.1063/1.3437054
Ämnesord nanomagnets, spin-dependent transport, thermomagnetoresistive oscillator
Ämneskategorier Den kondenserade materiens fysik, Magnetism

Sammanfattning

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.

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