Photo-induced Magnetic bubbles in the spin glass Alloy Fe2SnTe4

Abstract The ternary material Fe2SnTe4 is an amorphous metallic alloy that exhibits spin glass behavior with a freezing temperature of Tf = 12 K. When this material is cooled well below the spin glass freezing temperature (T = 5 K) and placed in a magnetization field, the zero-field-cooled spin glass state has been observed to absorb ultraviolet radiation with the concomitant generation of a magnetic bubble on the surface of the material. The photo-induced magnetic bubbles are detected via magnetization measurements with a superconducting SQUID susceptometer. Photomagnetic experiments are reported on the zero-fieldcooled and field-cooled specimens. Each of these experiments results in the generation of a magnetic bubble in the material.