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

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Author(s): Tingyong Chen; C Chien; Suber Huang; Mark D. Stiles;
Title: Enhanced Magnetoresistance Induced by Spin Transfer Torque in Granular Films with a Magnetic Field
Published: May 26, 2006
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
Pages: pp. 207203-1 - 207203-4
Keywords: granular materials;magnetoresistance;non-collinear magnetization;point-contact spectroscopy;spin-transfer torques
Research Areas: Nanomagnetics