Magnetic and electrical properties ascribed to the heterogeneous structure of new amorphous Fe-B-O system

Abstract

Ferromagnetic amorphous Fe‐B‐O films deposited by sputtering take a heterogeneous structure which consists of an amorphous Fe‐B alloy and an oxide B₂O₃ glass. The large saturation magnetization originates from the ferromagnetic Fe‐B alloy and the high electrical resistivity from the structure separated into metal and oxide phases. An anomalous change in the magnetic and electrical properties at about 46 at. % of Fe is due to changing of a continuous Fe‐B matrix into many particles isolated by B₂O₃.