Sarma, D. D. ; Ray, Sugata ; Tanaka, K. ; Kobayashi, M. ; Fujimori, A. ; Sanyal, P. ; Krishnamurthy, H. R. ; Dasgupta, C. (2007) Intergranular magnetoresistance in Sr2FeMoO6 from a magnetic tunnel barrier mechanism across grain boundaries Physical Review Letters, 98 (15). 157205_1-157205_4. ISSN 0031-9007
Full text not available from this repository.
Official URL: http://prl.aps.org/abstract/PRL/v98/i15/e157205
Related URL: http://dx.doi.org/10.1103/PhysRevLett.98.157205
Abstract
We present magnetization (M) and magnetoresistance (MR) data for a series of Sr2FeMoO6 samples with independent control on antisite defect and grain-boundary densities, which reveal several unexpected features, including a novel switching-like behavior of MR with M. These, in conjunction with model calculations, establish that the MR in Sr2FeMoO6 is dominantly controlled by a new mechanism, derived from the magnetic polarization of grain-boundary regions acting like spin valves, leading to behavior qualitatively different from that usually encountered in tunneling MR. We show that a simple and useful experimental signature for the presence of this spin-valve-type MR (SVMR) is a wider hysteresis in MR compared to that in M.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Physical Society. |
| ID Code: | 17551 |
| Deposited On: | 16 Nov 2010 09:35 |
| Last Modified: | 28 May 2011 09:15 |
Repository Staff Only: item control page
