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Thermally excited spin current and giant magnetothermopower in metals with embedded ferromagnetic nanoclusters

Research output: Contribution to journalJournal article

Published

Article number132403
Journal publication date11/10/2006
JournalPhysical Review B
Journal number13
Volume74
Number of pages4
Original languageEnglish

Abstract

We show that a thermally excited spin current naturally appears in metals with embedded ferromagnetic nanoclusters. When such materials are subjected to a magnetic field, a spin current can be generated by a temperature gradient across the sample as a signature of electron-hole symmetry breaking in a metal due to the electron spin-flip scattering from polarized magnetic moments. Such a spin current can be observed via a giant magnetothermopower which tracks the polarization state of the magnetic subsystem and is proportional to the magnetoresistance. Our theory explains the recent experiment on Co clusters in copper by S. Serrano-Guisan [Nat. Mater.5, 730 (2006)].

Bibliographic note

http://prb.aps.org/abstract/PRB/v74/i13/e132403