Triggering of spin-flipping-modulated exchange bias in FeCo nanoparticles by electronic excitation.

ABSTRACT: The exchange coupling between ferromagnetic (FM)-antiferromagnetic (AF) interfaces is a key element of modern spintronic devices. We here introduce a new way of triggering exchange bias (EB) in swift heavy ion (SHI) irradiated FeCo-SiO₂ films, which is a manifestation of spin-flipping at high irradiation fluence. The elongation of FeCo nanoparticles (NPs) in SiO₂ matrix gives rise to perpendicular magnetic anisotropy at intermediate fluence. However, a clear shift in hysteresis loop is evident at the highest fluence. This reveals the existence of an AF exchange pinning domain in the NPs, which is identified not to be oxide shell from XANES analysis. Thermal spike calculations along with first-principles based simulations under the framework of density functional theor

SUBMITTER: Sarker D 

PROVIDER: S-EPMC5171942 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature