Volume 94, Number 4, May 2011
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 May 2011|
Origin of the unconventional magnetoresistance in Sr2FeMoO6
Department of Materials Science, Indian Association for the Cultivation of Science Jadavpur, Kolkata 700 032, India
2 Centre for Advanced Materials, Indian Association for the Cultivation of Science Jadavpur, Kolkata 700 032, India
3 UGC-DAE CSR, University Campus - Khandawa Road, Indore 451 027, India
4 S. N. Bose National Centre for Basic Sciences, Sector-III, Block-JD - Kolkata 700 098, India
5 Sincrotrone Trieste, Area Science Park - 34012 Basovizza, Trieste, Italy, EU
6 Solid State and Structural Chemistry Unit, Indian Institute of Science - Bangalore 560 012, India
Accepted: 7 April 2011
The unusual magnetoresistance (MR) behavior in Sr2FeMoO6, recently termed as spin-valve–type MR (SVMR), presents several anomalies that are little understood so far. The difficulty in probing the origin of this phenomenon, arising from the magnetic property of only a small volume fraction of the ferromagnetic bulk, is circumvented in the present study by the use of ac susceptibility measurements that are sensitive to the slope rather than the magnitude of the magnetization. The present study unravels a spin-glass (SG) like surface layer around each soft ferromagnetic (FM) grain of Sr2FeMoO6. It is also observed that there is a very strong exchange coupling between the two, generating “exchange bias” effect, which consequently creates the “valve”, responsible for the unusual MR effects.
PACS: 75.47.-m – Magnetotransport phenomena; materials for magnetotransport / 73.40.Gk – Tunneling / 72.80.Ga – Transition-metal compounds
© EPLA, 2011
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