Bulletin of the American Physical Society
APS March Meeting 2012
Volume 57, Number 1
Monday–Friday, February 27–March 2 2012; Boston, Massachusetts
Session A15: Focus Session: Spins in Metals - Thermal Effects on Magnons and Spin Currents
8:00 AM–11:00 AM,
Monday, February 27, 2012
Sponsoring Units: DMP FIAP GMAG
Chair: Stewart Barnes, University of Miami
Abstract ID: BAPS.2012.MAR.A15.4
Abstract: A15.00004 : Intrinsic spin-dependent thermal transport*
8:36 AM–9:12 AM
Preview Abstract Abstract
(Department of Physics and Astronomy, The Johns Hopkins University)
Spin caloritronic effect, such as spin Seebeck effect, has attracted a great deal of attention recently. In most cases such studies have been made on patterned ferromagnetic thin films on substrates. The mechanism of spin Seebeck effect has evolved from intrinsic difference in the spin chemical potentials to magnon-phonon interaction through the substrate. We use patterned ferromagnetic thin film to demonstrate the profound effect of a substrate on the spin-dependent thermal transport. With different sample patterns and on varying the direction of temperature gradient, both longitudinal and transverse thermal voltages exhibit asymmetric instead of symmetric spin dependence. This unexpected behavior is due to an out-of-plane temperature gradient imposed by the thermal conduction through the substrate and the mixture of the anomalous Nernst effects. Only with substrate-free samples have we determined the intrinsic spin-dependent thermal transport with characteristics and field sensitivity similar to those of anisotropic magnetoresistance effect.
*In collaboration with S. Y. Huang (JHU), W. G. Wang (JHU), S. F. Lee (IoP, Academia Sinica in Taiwan), and J. Kwo (NTHU and NTU in Taiwan). This work has been supported by the US NSF grant DMR 05-20491 and the Taiwan NSC grant 99-2911-I-007-510.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2012.MAR.A15.4
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700