Proximity-induced perpendicular magnetic anisotropy at Fe/Au(111) interfaces studied by synchrotron radiation Mössbauer spectroscopy

摘要

Interfacial magnetic proximity can be a novel technology for developing and enhancing the spin-related functionalities. The designing of orbital hybridization at the interfaces becomes a key issue. Especially, the hybrid structures combining different sin-orbit coupling strength provide the cooperative effect such as perpendicular magnetic anisotropy (PMA) and quadrupole formation. We focus on Au(111)/Fe structure as a magnetic metal and non-magnetic metal interface because the proximity between the Rashba-type spin-orbit coupling constant in Au and magnetic Fe layer brings interfacial PMA . Until now, there are many reports for investigations of electronic structures in magnetic layers on Rashba-type spin splitting . However, the element-specific studies for Au/Fe interface are limited on the x-ray magnetic circular dichroism and photoemission spectroscopy . The Mössbauer spectroscopy (MS) for Fe using synchrotron radiation also becomes a powerful tool by using enriched 57Fe isotope substitution. Here, we adopt MS to investigate Au/Fe interfaces to elucidate the layer-resolved electronic and magnetic properties.