Anisotropy of the Europium-Iron Exchange Interaction in Rare-Earth Iron Garnets

Atzmony, U.; Bauminger, E. R.; Mustachi, A.; Nowik, I.; Ofer, S.; Tassa, Menachem

doi:10.1103/physrev.179.514

Cited by 22 publications

(3 citation statements)

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“…These values are in good agreement with the Mossbauer values 1 of 629 ± 10 and 571 ± 10 kG. ( (2) with similar equations for x and y. Here the first term is the part of v' which arises from the polarization of the 4/ orbitals by the exchange field (which is axial with respect to the direction of M), while the second term is the part of v' due to the crystal lattice.…”

supporting

confidence: 87%

“…This has been interpreted in terms of electron spin-spin relaxation which is fast at low temperature and which slows with increasing T because of the thermal excitation of the system out of the fast-relaxing ground doublet. 2 MSssbauer measurements at large H/T have confirmed that there is no fortuitous cancellation of the internal field in the ground doublet and, in fact, that a contact field near the usual value of 110 kG per unpaired electron is present. 3 The only puzzling feature has been the failure of attempts to reduce the relaxation rate by diluting the spins.…”

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confidence: 88%

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Nuclear Magnetic Resonance Studies ofEu151andEu153in Europium I

Streever¹,

Caplan²

1970

Phys. Rev. Lett.

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The nuclear magnetic resonances of Eu 151 and Eu 153 have been studied in single crystals of europium iron garnet with externally applied fields of sufficient magnitude to align the magnetization along various crystallographic directions. Hyper fine-field and quadrupole-splitting parameters are obtained. Contributions to the electric field gradients and anisotropic hyperfine fields are discussed and compared with theory.

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supporting

confidence: 87%

mentioning

confidence: 88%

Nuclear Magnetic Resonance Studies ofEu151andEu153in Europium I

Streever¹,

Caplan²

1970

Phys. Rev. Lett.

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“…I t has not yet proved experimentally feasible to make Mossbauer experiments except when the iron is magnetized in the easy direction. However, Atzmony et at. (1969) hit upon the clever trick of comparing the Mossbauer patterns of the Eu ion (obtained by decay of Sm) in Eu i.g.…”

Section: The Anisotropic Exchange Parametersmentioning

confidence: 98%

Theory of the magnetic anisotropy and nuclear magnetic resonance of europium iron garnet

Foglio

Vleck

1974

Proc. R. Soc. Lond. A

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The magnetic anisotropy of europium iron garnet is caused by the combined effect of the crystalline field and anisotropic exchange, of which the latter proves to be the more important. Most of the parameters required for the analysis are derived in part A from the available experimental results on nuclear magnetic resonance, spectroscopy, magnetization and Mössbauer technique. The exchange parameters G m n , n ≽ 4 (i. e. fourth and higher degree harmonics) cannot be obtained in this manner. When their values are set equal to zero the magnetic anisotropy constant K 1 (or rather K 1 + ⅓ K 2 ) coincides in sign and order of magnitude with the experimental result. From the present study, it becomes apparent that the value of K 1 is very sensitive to small changes in the parameters G m 4 . Consequently the calculations are repeated for different values of the G m 4 and it is then possible to satisfy simultaneously the experimental values of K 1 + ⅓ K 2 and the available results on the ferromagnetic resonance of Eu i. g. (to be discussed in another paper). The formulae used to derive from the experimental results the parameters required in the calculation are presented in part B, together with a critical discussion of those used to describe the nuclear magnetic resonance of Eu in Eu i. g. The only apparent inconsistency in the theory relates to the quadrupolar substructure in the n. m. r. when averaged over the three principal local axes. It is half as large as predicted theoretically and the discrepancy cannot be blamed on higher order harmonics or uncertainty in the parameters. A possible explanation could be unexpectedly large biquadratic superexchange.

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Magnetic Properties of Ferrites

Guillot

2006

Materials Science and Technology

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Anisotropy of the Europium-Iron Exchange Interaction in Rare-Earth Iron Garnets

Cited by 22 publications

References 33 publications

Nuclear Magnetic Resonance Studies ofEu151andEu153in Europium I

Nuclear Magnetic Resonance Studies ofEu151andEu153in Europium I

Theory of the magnetic anisotropy and nuclear magnetic resonance of europium iron garnet

Magnetic Properties of Ferrites

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