Exchange Bias in IrMn3/Py Bilayers
Abstract
Recently antiferromagnets have gained increased interest as active components for spintronics due to their intrinsic high frequency dynamcis and resulting zero net magnetic moment. One such material is IrMn3 with the magnetic moments forming a triangular structure in the (111) planes and a giant magnetocrystalline anisotropy energy of 10 meV per formula unit. We prepared films of IrMn3 on different substrates [001]MgO, [0001]Al2O3 and Si. Since spin-orbit torques are most pronounced for [100] oriented IrMn3 we investigated the temperature and cooling field dependence of exchange bias. X-ray diffraction shows predominantly [100] crystallographic orientations, with also a small contribution due to [111] oriented grains. Magnetometry measurements using a quantum design superconducting quantum interference device (SQUID) show that the exchange bias decreases with increasing temperature and an anisotropy of the coercivity with in-plane field direction.
This work was supported by the U.S. Department of Energy, Office of Science, Materials Science and Engineering Division and CNPq, Conselho Nacional de Desenvolvimento Científico e Tecnológico - Brasil (Scholarship).- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..MARF39008H