The magnetoelastic coupling in Y3Fe5O12

The "one-ion" magnetoelastic coupling (mec) coefficients [1] b1and b2for the Fe³⁺ion, an octahedral position of YIG, were found from the composition dependence measurements of λ100and λ111. Their measurements were made by the FMR method on the crystals Y3Fe5-αScαO12(α = 0; 0.48). The coefficients b1and b2are b1= (19 ± 2).10⁶erg.cm^-3and b2= (9.3 ± 1).10⁶erg.cm^-3. Then the measurements of these values were made by the EPR method at the frequency 36 GHz in Y3Ga5O12with about 0.1% Fe: b1= (9.2 ± 4).10⁶erg.cm^-3and b2= (7.2 ± 2).10⁶erg.cm^-3. These values are in good conformity with FMR data. This fact proves a predominant role of "one-ion" mec in the formation of YIG magnetostriction.