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Resonant studies of the effect of Bi3+ impurity on magnetic anisotropy and phase diagrams in gadolinium ferroborate GdFe3(BO3)4
Russian version
Pankrats A.I.1, Skorobogatov S. A.1,2, Khoroshiy I. N.1, Zharkov S. M.1,2, Zeer G. M.2, Gudim I. A.1, Titova V. R.1
1Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia
2Siberian Federal University, Krasnoyarsk, Russia
Email: pank@iph.krasn.ru
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The resonant properties of gadolinium ferroborate GdFe3(BO3)4 single crystals of varying quality are compared: nominally pure and those containing Bi3+ ion impurities. The EDS method determined that the actual bismuth impurity content is close to the previously estimated 6 % based on magnetic studies. The resonance properties confirm that both crystals form similar magnetic phase diagrams with an orientational transition between easy-axis and easy-plane antiferromagnetic ordering, which occurs either as a spontaneous transition at temperature TSR or as a transition to a magnetic field-induced easy-plane state at T<TSR. Temperature dependencies of the effective magnetic anisotropy fields and the magnetoanisotropic contributions of the iron and gadolinium subsystems are calculated from the resonance data. It is concluded that the Bi3+ ion impurity not only suppresses the contribution of the gadolinium subsystem, which these ions partially replace, but also causes a reduction in the contribution of the iron subsystem. As a result, the total change in the effective anisotropy field of the crystal is rather weak. Keywords: magnetic anisotropy, resonance properties, magnetic phase diagrams, rare-earth ferroborates
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