Enhanced Magnetoresistance Induced by Spin Transfer Torque in Granular Films with a Magnetic Field

Published

May 26, 2006

Author(s)

Tingyong Chen, C Chien, Suber Huang, Mark D. Stiles

Abstract

Spin-transfer torques (STT) provide a mechanism to alter the magnetic configurations of magnetic heterostructures, a result previously only achieved by an external magnetic field. In granular solids, we demonstrate a new form of STT effect that can be exploited to induce a large spin disorder when combined with a large magnetic field. As a result, we have obtained a very large magnetoresistance effect in excess of 400% at 4.2 K in a large magnetic field, the largest ever reported in any metallic systems. The STT characteristics of granular solids differ significantly from those of multilayers, showing no STT effect at low magnetic fields but prominent STT effects at high fields.

Citation

Physical Review Letters

Volume

96

Issue

20

Pub Type

Journals

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Keywords

granular materials, magnetoresistance, non-collinear magnetization, point-contact spectroscopy, spin-transfer torques

Citation

Chen, T. , Chien, C. , Huang, S. and Stiles, M. (2006), Enhanced Magnetoresistance Induced by Spin Transfer Torque in Granular Films with a Magnetic Field, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=620583 (Accessed October 14, 2025)