Temperature and high magnetic field dependence of the Faraday rotation in the terbium iron garnet

Abstract

The Faraday rotation of terbium iron garnet at 1.15 μ wavelength is presented. The experimental results have been obtained along the [111] easy direction both in low d.c. field 20 kOe as a function of temperature between 4.2 and 300 K and at room temperature as a function of the applied field (up to 1 200 kOe). The results are analysed in terms of magnetic and electric dipole contributions from the three magnetic sublattices. The Fe3+ contributions are considered to have the same values as in YIG and the total Tb3+ contributions are obtained. The contribution of the magnetic dipole transitions of the R.E. has been calculated when the influence of the crystalline field effect on the Landé factor is taken into account; the electric dipole contribution is found to be strongly temperature and magnetic field dependent

Bi-Dyig Films : Analysis of the Dy Contribution to the Faraday Rotation.

“…The upper (rep lower) sign is valid for T < Tcomp (rep T > Tcomp). As in the {cl sublattice, only the Di+ ions are magnetic, Cm is small (6.1 deg.cm·\ J.lBl (references reviewed in [14]) and the magnetic contribution of the rare-earth sublattice can be neglected. The "e" dipole transitions contribution is then deduced from Eq.…”

“…Assuming that the contribution to the Faraday rotation of DyBiIG by iron ions is simply represented 163 by that of BiYIG measured in the same ~perimental conditions [14], the total contribution to FR of the Di+ sublattice is given by : (1) where Cc and Cm are the respective magneto-optical electric "e" and magnetic "m" dipole coefficients. The upper (rep lower) sign is valid for T < Tcomp (rep T > Tcomp).…”

Faraday rotation spectra of bismuth-substituted rare-earth iron garnet crystals in optical communication band

“…One is to compare the FR in different RE garnets using the hypothesis wherein the contribution from Fe 3ϩ sublattices is the same in all heavy RE garnets; this contribution is considered to have the same value as measured in Y 3 Fe 5 O 12 ͑YIG͒. 5 Using this approach, the contribution to FR from RE ions and bismuth ions at a definite wavelength can be calculated by comparing the values of FR in REIG or bismuth-substituted REIG ͑REBIG͒ and YIG crystals. However, it is difficult to predict the FR at different wavelengths.…”