β Scribed by M.I. Kobets; K.G. Dergachev; E.N. Khatsko; S.L. Gnatchenko; L.N. Bezmaternykh; V.L. Temerov
No coin nor oath required. For personal study only.
The AFMR spectra of the NdFe 3 (BO 3 ) 4 crystal are measured in a wide range of frequencies and temperatures. It is found that by the type of its magnetic anisotropy the compound is an ''easy-plane'' antiferromagnet with a weak anisotropy in the basal plane. The effective magnetic parameters are determined: anisotropy fields H a1 ΒΌ 1.14 kOe and H a2 ΒΌ 60 kOe and magnetic excitation gaps Dn 1 ΒΌ 101.9 GHz and Dn 2 ΒΌ23.8 GHz. It is shown that commensurate-incommensurate phase transition causes a shift in resonance field and a considerable change in absorption line width.
At temperatures below 4.2 K nonlinear regimes of AFMR excitation at low microwave power levels are observed.
π SIMILAR VOLUMES
Rare-earth ferroborates RFe 3 (BO 3 ) 4 Quadrupole moments a b s t r a c t Recent experimental data for magnetostriction in the rare-earth (RE) ferroborates RFe 3 (BO 3 ) 4 with R ΒΌ Pr and Tb are discussed from a theoretical point of view. Multipole moments of RE ions are calculated in the framework
## Abstract The ground state of Gd^3+^ ions substituting for Y^3+^ in YAl~3~(BO~3~)~4~ single crystal has been studied by EPR method. Spin Hamiltonian parameters and their signs for Gd^3+^ ion in trigonal symmetry (__g__~__z__~β=β1.9893βΒ±β0.0002, __g__~__x__~β=β__g__~__y__~β=β1.9860βΒ±β0.0002; $b\_2