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Title: Some properties of magnetic ions and their interaction
Author: Hutchings, Michael
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 1963
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Introduction: The techniques of electron paramagnetic resonance (E.P.R.) have been used to investigate the interaction of rare earth ions with (a) their crystalline environment, by measuring their effective g tensor, and, (b) each other, by observing their pair spectra. The experiments have been carried out in host lattices which, when magnetically concentrated, show interesting ordering properties. The Apparatus: Measurements have been made at both X and K Band frequencies. The X Band spectrometer, originally constructed by Drs. A.H. Cooke and J.G. Park, was modified by the addition of a 115 Ke/s, and 50 c/s, phase sensitive detection system to give greater sensitivity. The K Band spectrometer was designed with a tuneable cylindrical H011 transmission cavity, and incorporated an improved system of cryogenics. E.P.R. of rare earth ions in diamagnetic garnets: The investigation of the properties or rare earth ions la diamagnetic garnets is of importance in connection with their profound influence on the ferrimagnetism of the iron garnets (for example see Dillon et al. 1960). The results of Ryan (1960) on the E.P.R. of rare earth lone in yttrium aluminium garnet (YAG) and yttrium gallium garnet (YGG) have shown a considerable difference of their g tensor in the two lattices, particularly for the case of Kr3+. In order to investigate further this variation, in particular the dependence on the host ion in the rare earth site, measurements have been made of the g tensors in the lutetium garnets LAG and LGG. The results, obtained mainly at X Band and 4.2°K, are given in Table 1 together with that for Dy3+ in YAG where no resonance had previously been observed. They indicate that the variation between lutetium and yttrium lattices is not so great as that between the aluminium and gallium lattices.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available