Spin Textures in Correlated Oxide Devices Probed by Electrical Transport

The rich materials landscape intrinsic to correlated oxides can be tailored with strain, octahedral rotation, choice of substrates etc. and has played a pivotal role in the discovery of emergent phenomena in such materials. Breaking of inversion symmetry at such perovskite surfaces and at heterointerfaces, combined with spin-orbit interactions has enabled new approaches to control spin textures in them. This has led to new device applications ranging from electric field control of electronic devices, voltage control of magnetic state as well observation of new spin textures. In recent times, the competing ground states in ferro and antiferromagnetic oxides has become a topic of great interest and is found to host new magnetic textures. However, this has also challenged conventional bulk magnetization techniques to probe such coexisting magnetic ordering in electronic devices used for spin transport studies. In this regard, Anomalous Hall (AHE) and Spin Hall magnetoresistance (SMR) have established themselves as important tools to electrically probe the magnetic order of spontaneously ordered magnetic materials, particularly in antiferromagnets, that are rapidly evolving as a league of their own in Spintronics. Magnetic textures tailored by strain, octahedral rotation or choice of substrates in correlated antiferromagnetic oxides and probed by all-electrical transport schemes will be discussed in this talk. Temperature and angular dependence of the spin resistance establishes competing spatial magnetic exchange across the thin films, not revealed by complementary magnetotransport techniques. The probing, understanding and manipulation of magnetic order using electrical schemes, opens new avenues to study electric field control of spin and magnon transport that has relevance in information technology applications.