Temperature dependence of the first magnetocrystalline anisotropy constant of polycrystalline Ca-In-V and Ca-Zr-YIG

Abstract

A method to compute the first order anisotropy constant K1 from ferrimagnetic resonance linewidth measurements on polycrystalline samples is discussed and applied to Ca-In-V and Ca-Zr substituted YIG. Experimental accuracy of about ±103 erg/cm3 can be achieved with second-phase free, dense (≳99%) and carefully polished spheres. The temperature dependence of K1 from −196 °C to about Curie point have been measured for both garnet families.