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Calculation of the magnetization–temperature dependence of rare‐earth and yttrium iron garnet solid solutions
Author(s) -
Falileev G. N.
Publication year - 1979
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220960145
Subject(s) - magnetization , yttrium , rare earth , exchange interaction , ion , condensed matter physics , yttrium iron garnet , materials science , saturation (graph theory) , chemistry , physics , mineralogy , ferromagnetism , magnetic field , oxide , metallurgy , mathematics , organic chemistry , quantum mechanics , combinatorics
Using the known compensation temperature–concentration dependences in the molecular field theory simple expressions for calculating the temperature dependences of the c‐sublattice magnetization and the saturation magnetization for the iron garnet (IG) solid solutions of the Y 3– c ‐R c Fe 5 O 12 (R = Gd, Tb, Dy, Ho, Er, Tm, Yb) type are obtained. The calculated data agree well with the experiment at T ⪆ 150 K. The discrepancy between the calculated data and the experiment at T ⪅ 150 K is due to the rare‐earth ion interaction. The correction for this interaction shows that in IG″ besides the Kramers‐Anderson exchange between the rare‐earth ions there exists an additional exchange interaction like that of the Ruderman‐Kittel‐Kasuya‐Yosida (RKKY) type playing an important role at temperatures lower than “the low temperature” point. The expression is obtained with a correction for interactions between the rare‐earth ions using the experimental magnetization temperature dependence of “pure” rare‐earth IG of the R 3 Fe 5 O 12 type, which allows the calculation of the magnetization–temperature dependence of IG under investigation including temperatures ⪅ 150 K.