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THE MAGNETIC PROPERTIES OF RARE EARTH IONS IN GARNETS
OXFORD UNIV (ENGLAND) CLARENDON LAB
Susceptibility measurements in the range 20 to 1.5 K are reported for the 8 paramagnetic garnets with the composition R3X5O12, where R equals Gd3, Tb3, Ho3 or Tm3 and X equals Al3 or Ga3 together with microwave resonance determinations of the principal g-values of the ions Nd3, Dy3, Er3 and Yb3 substituted into diamagnetic Lu3Al5O12 and Lu3Ga5O12. Results are interpreted qualitatively as indicating highly anisotropic and relatively large local crystalline electric fields, and the effect of these on the properties of ferrimagnetic rare earth iron garnets is concerned. In the ferrimagnetic garnets, the rare earth ions will almost always divide into 6 non-collinear sublattices, whose magnetic moments make quite large angles with the 2 antiparallel Fe sublattices. For YbIG, it was possibl o make a numerical estimate of the angles of canting. Author
AF61 052 125