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Tunnelling magnetoresistance; tunnel boundary; disorder; double perovskite.

Tunnelling magnetoresistance (TMR) in polycrystalline double perovskites has been an important research topic for more than a decade now, where the nature of the insulating tunnel barrier is the core issue of debate. Other than the nonmagnetic grain boundaries as conventional tunnel barriers, intragrain magnetic antiphase boundaries (APB) as well as magnetically frustrated grain surfaces have also been proposed to act as tunnel barriers in Sr₂FeMoO₆. In this review, the present state of the debate has been discussed briefly and how the physical state of the material can affect the magnetoresistance signal of double perovskites in many different ways has been pointed out.

Abhishek Nag¹ Sugata Ray^{1 2}

1. 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

Published

June 2015

Early published

28 May 2015