Magnetooptical Properties of Ce-Doped YIG Single Crystals

Abstract

The Faraday rotation (FR) of cerium substituted yttrium iron garnets single crystals Ys,C+Fe>On (YIG:Ce) with x=0.055 has been investigated at 1152 and 632.8 nm in the 6 K-600 K temperature range and magnetic field up to 20 kOe applied along the [Ill] and [loo] directions. In contrast to magnetic roperties, the FR of MG.Ce is strongly different fiom FR of pure MG at both wavelengths. The FR contribution of the Cegf ions, mainly attributed to intra-ionic electric dipole transitions between the 4P and 4P 5d1 configurations, is discussed within the fiame of the one-ion model of fehagnetic gamets.

Enhancement of YIG bandwidth efficiency through Ce-doping for dielectric resonator antenna (DRA) applications

“…This indicated that the presence of Ce enhanced the formation of YIG phase. This is in agreement with Uniyal and Yadav work's [21]. They found that the substitution with moderate amount of rare earth ions could eliminate or transform the impurity phase of YIP to YIG.…”

“…To date, various dopants (e.g. La, In, Sr, Sn, Sc, Si) are found to have shown significant magnetic properties of YIG [19][20][21]. However, no One of the possible dopants that could be used for this purpose is CeO 2 .…”

An integrated magneto-optic modulator for cryogenic applications

“…Equation (1) and Fig. 1a-c are crucial for understanding the operating principle of this device; therefore, we highlight a few important features: (1) reversing the current (that is, flipping the in-plane magnetic field in Ce:YIG) changes the sign of Δn eff ; (2) the effective index change differs for the clockwise (CW) and counterclockwise (CCW) propagating modes, having the same amplitude but opposite signs (non-reciprocal effect); (3) the effective index change is the largest when the optical mode is polarized along the y axis (transverse-magnetic polarized mode); (4) the value of the effective index change is proportional to the Faraday rotation constant (Supplementary Section 1), which is expected to increase with decreasing temperature 17,26 .…”

“…As reported in Supplementary Section 3.4, Ce:YIG becomes magnetically harder at lower temperatures and a 110 mA electrical current (1.5 mT magnetic field) is not sufficient to magnetically saturate it. Although the Faraday rotation of Ce:YIG is expected to increase for decreasing temperatures 17,26 , a higher magnetic field is needed to reach such a value because of the stronger coercive force that limits the MO split at 77 and 4 K compared with the room-temperature case.…”

Temperature-dependent Faraday rotation and magnetization reorientation in cerium-substituted yttrium iron garnet thin films

“…However, investigation of the temperature-dependence of the MO and magnetic properties of Ce:YIG is limited and mostly focused on bulk materials. [21][22][23][24] Temperature-dependent studies of bulk Ce:YIG demonstrate an increase of saturation magnetization 22 and Faraday rotation 21 upon cooling which is well approximated by a linear function in the regime from room temperature (RT) to liquid nitrogen temperature. There are little data on magnetocrystalline anisotropy or magnetostriction of Ce:YIG, but rare earth iron garnets typically show a monotonic increase of the magnetocrystalline anisotropy by a factor of 5-50 and an increase in magnetostriction coefficients by a factor of 2-5 when cooled down from RT to liquid nitrogen temperatures.…”