Thermomagnonic diode: Rectification of energy and magnetization currents

Simone Borlenghi, Stefano Lepri, Lars Bergqvist, and Anna Delin

Phys. Rev. B 89, 054428 – Published 26 February 2014

Abstract

We investigate the dynamics of two coupled macrospins connected to thermal baths at different temperatures. The system behaves like a diode which allows the propagation of energy and magnetization currents in one direction only. This effect is described by a simple model of two coupled nonlinear oscillators interacting with two independent reservoirs. It is shown that the rectification phenomenon can be interpreted as a a stochastic phase synchronization of the two spin oscillators. A brief comparison with realistic micromagnetic simulations is presented. This new effect yields promising opportunities in spin caloritronics and nanophononic devices.

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Received 1 November 2013
Revised 3 February 2014

DOI:https://doi.org/10.1103/PhysRevB.89.054428

Authors & Affiliations

Simone Borlenghi^1,*, Stefano Lepri^2,3, Lars Bergqvist^1,4, and Anna Delin^1,4,5

¹Department of Materials and Nanophysics, School of Information and Communication Technology, Electrum 229, Royal Institute of Technology, SE-16440 Kista, Sweden
²Consiglio Nazionale delle Ricerche, Istituto dei Sistemi Complessi, Via Madonna del Piano 10, I-50019 Sesto Fiorentino, Italy
³Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino, Italy
⁴SeRC (Swedish e-Science Research Center), KTH, SE-10044 Stockholm, Sweden
⁵Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120 Uppsala, Sweden

^*simonebg@kth.se

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Vol. 89, Iss. 5 — 1 February 2014

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Physical Review B

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