A theoretical study of the magnetic and magneto-optical properties of Nd-substituted yttrium iron garnets

Abstract

The neodymium substitution in yttrium iron garnet induces a large enhancement of the Faraday rotation although the magnetic moment of the Nd 3+ ion in yttrium iron garnet is very small. A detailed theoretical analysis of both magnetic and magneto-optical (MO) properties in Nd x Y 3−x Fe 5 O 12 using the quantum theory is developed. The intra-ionic electric dipole transitions between the 4f 3 and 4f 2 5d configuration split states are studied taking into account the spinorbit, crystal field and super-exchange interaction perturbations. For the excited configuration, the coupling scheme of Yanase is extended to the Nd 3+ ion. A good agreement between experimental and calculated values is obtained for the temperature dependence of both the magnetic moment and Faraday rotation, and the MO resonance frequencies. Attention is paid to the mixing of the ground state multiplets. It is concluded that the Faraday rotation is well described by the intra-ionic electric dipole transition model and is unambiguously of the paramagnetic type.

High Saturation Induction for Bi-Substituted Yttrium Iron Garnet Prepared Via Sol Gel Technique

“…The magnetic and electric properties of these YIG compounds changed slightly or drastically based on the type and quantity of dopant as well as substituent employed. Recent studies involved the work of Marysko [5] , who studied the properties of cobalt doped YIG films and the work of Xhang et al that focused on the magneto-optical properties of Nd substituted YIG [6] . This work however deals with preparation of Bi-Y 3 Fe 5 O 12 samples using conventional, solid-state and novel, sol-gel techniques.…”

Mechanisms of the Magneto-Optical Activity of Rare-Earth Ions in Rare-Earth Iron Garnet Single Crystals

“…The peculiarities of the FR involving narrow intraconfigurational f -f absorption bands of R 3+ ion and a wider The results of our experiments may be explained via the quantum theory of FR, taking into account the influence of effective magnetic fields on the splitting of the ground and excited multiplets of rare-earth ions and the mixing of wave functions of ground and excited multiplets of rare-earth ions. The electric dipole transition between the 4 f 3 and 4 f 2 5d configurations may be studied by taking into account the spin-orbit crystal field and superexchange interaction in the development [7].…”

“…Anomalous great magneto-optical activity is the result of joint action of similar in sign and approximately equal in quantity paramagnetic and diamagnetic mechanisms in Nd-Y garnets system, but not the only paramagnetic as authors [7] declare. • the diamagnetic mechanism dominates the FR in Yb, Er, Sm, Gd garnets;…”

“…Dispersive MO effects in pure and substituted rare-earth iron garnets (RIG) have been the subject of numerous experimental and theoretical investigations [1][2][3][4][5][6][7][8][9][10][11].…”

The magneto-optical activity of rare-earth ion in Y-substituted erbium and neodymium iron garnets

“…Dispersive MO effects in pure and substituted rare-earth iron garnets (RIG) have been the subject of numerous experimental and theoretical investigations [1][2][3][4][5][6][7][8][9][10][11][12]. To the best of our knowledge, despite the abundant literature, few results concerning the FR in the RIG have been published [5][6][7][8].…”