Faraday-rotation spectra of the diluted magnetic semiconductor Cd1−xGdxTe

Abstract

The Faraday rotation as a function of photon energy for Cd1−xGdxTe with x=0.012 and 0.030 in the temperature range of 85–300 K has been measured. The Verdet constant includes a positive part and negative part due to pure Zeeman and sp-f exchange interaction contributions, respectively. The sp-f exchange interaction parameter has been determined in Cd1−xGdxTe: (q=9.3×10−4 at 85 K and q=5.3×10−4 at 300 K) in terms of a microscopic model, which takes into account the k dependence of the spin-spin exchange interaction. The normalization parameter C has been found to be independent of both the compositions of Gd and temperature. The agreement between the data and the microscopic model is very good in the whole spectra region even far from the band gap.

Optical and magnetooptical study of CdTe crystals doped with rare earth ions

“…The theory [12] explained experimental results on Faraday rotation spectra in Cd 1−x Mn x Te and Zn 1−x Mn x Te crystals by using only two (normalization and exchange interaction) parameters. Besides, recent experimental results on Faraday rotation in Cd 1−x Gd x Te solid solutions [4] which include rare earth element Gd were interpreted in term of a microscopic model. According to this theory [12] the Verdet constant can be expressed by.…”

“…For this class of materials spin-related phenomena such as enhanced Zeeman spin splitting of the band states and giant Faraday rotation which are due to spin exchange interactions between band carriers and magnetic ions have been revealed. In particular, it has been reported of magnetooptical features for case of Cd 1−x Gd x Te solid solutions [4] and doped CdTe:Dy crystals [5]. Nevertheless, large magnetooptical effects induced by the exchange interaction between electrons and magnetic ions in rare earth based semimagnetic semicoductors are not well understood yet.…”

Synthesis of Magnetic Ions-Doped QDs Synthesized Via a Facial Aqueous Solution Method for Optical/MR Dual-Modality Imaging Applications

“…There are also a number of works such as optical-magnetic bi-functional paramagnetic ions-doped quantum dots (MDQDs) based on CdSe [42,43], CdTe [44,45], ZnO [46] and Si [47,48] QDs that have been designed and researched. Matching to the papers, there are only a few reports on the optical properties [53][54][55] and the magnetic properties of rare-earth-doped CdTe such as Gd +3 , Eu +3 , and Mn +2 -doped CdTe in any form.…”

Giant Faraday Rotation in CdTe Spin-Doped with Rare Earth Ions

“…Until now similar spin-related phenomena have not been revealed for the case of II-VI based SMSs containing rare earth ions. Recently, results of Faraday rotation measurements on the SMS material Cd 1--x Gd x Te in the temperature range of 85-300 K have been reported [8]. However, the absolute value of the Verdet constant was found not to differ much from that of CdTe crystal.…”