Tunable competing magnetic anisotropies and spin reconfigurations in ferrimagnetic Fe100-xGdx alloy films

Article

关键词: TRANSITION-METAL ALLOYS;    THIN-FILMS;    GD-FE;    TRANSVERSE SUSCEPTIBILITY;    MAGNETOOPTICAL PROPERTIES;    PERPENDICULAR ANISOTROPY;    TB;    MICROSTRUCTURE;    RESONANCE;   

DOI  :  10.1103/PhysRevB.104.094404

来源: SCIE

【 摘 要 】

We report a comprehensive study of the temperature evolution of in-plane (IP) and out-of-plane (OOP) effective magnetic anisotropies in compensated ferrimagnetic Fe100-xGdx alloy films by employing direct current magnetometry and radiofrequency (RF) transverse susceptibility (TS) measurements. We suggest that our Fe100-xGdx system is chemically inhomogeneous and phase segregates into Fe- and Gd-enriched regions. Our IP and OOP magnetometry results indicate that the system undergoes a temperature-driven transformation from an IP-spin-configuration-dominated state to an OOP-spin-configuration-dominated state below a certain temperature (spin reorientation temperature). A two-step reversal behavior emerges in the OOP M(H) loop near compensation, which we attribute to the sequential magnetization reversals of Fe- and Gd-enriched domains. Field-induced spin-flop transitions were also observed near the compensation. Our RF TS measurements indicate that the effective magnetic anisotropy for the OOP configuration dominates over that for the IP configuration below a certain spin reorientation temperature. Both IP and OOP anisotropy fields determined from our TS measurement exhibit a minimum around the compensation temperature, which has been explained in the framework of the Stoner-Wohlfarth model.

【 授权许可】

Free