Recent progress in magneto-optics and research on its application (Review)

Abstract

Transient spectral dependence of photoinduced magneto-optical Faraday effect in CdTe quantum dots AIP Advances 2, 012116 (2012); 10.1063/1.3679403Magneto-optical spectra of excitons and Landau subbands in strained CdTe epitaxial films under high magnetic fields Various kinds of magneto-optical properties are investigated in rare earth orthochromites. From an analysis of Cr 3ϩ exciton absorption in RCrO 3 ͑RϭTb, Dy, and Ho͒, it is unferred that these compounds exhibit an anomalous spin-reorientation in a magnetic field along the b axis, where the weak ferromagnetic moment of the Cr 3ϩ spins rotates in the ac plane perpendicular to the b axis. In these compounds, when the R 3ϩ spin configuration is disordered, an anomalous satellite band appears on the lower-energy side of the Cr 3ϩ exciton absorption, which is associated with the breakdown of the kϭ0 selection rule due to the disorder of the R 3ϩ spin configuration. In YbCrO 3 , various kinds of cooperative excitations, such as a Cr 3ϩ exciton coupled with an Yb 3ϩ magnon and a Cr 3ϩ ϪYb 3ϩ exciton molecule, which are induced by the antisymmetric exchange interaction between the Cr 3ϩ and Yb 3ϩ spins, appear in the visible region. The propagation of these cooperative excitations depends strongly on the spin structure and the external magnetic field. In ErCrO 3 , a photo-induced spin-reorientation takes place within 50 s after the photo-irradiation corresponding to the 4 A 2g → 2 E g transition of Cr 3ϩ , and it returns to the initial spin configuration in about 400 ms. This phenomenon is detected in the time-resolved Er 3ϩ absorption spectra corresponding to the 4 I 15/2 → 4 I 9/2 transition. Finally, we briefly review the recent frontier research on applications developed mainly in Japan.

Mild Hydrothermal Crystallization of Heavy Rare-Earth Chromite RECrO3 (RE = Er, Tm, Yb, Lu) Perovskites and Magnetic Properties

“…ErCrO 3 undergoes a second-order magnetic transition at 22 K changed from Γ 4 (G x A y F z ) to Γ 1 (A x G y C z ), while other heavy rare-earth RECrO 3 keeps as Γ 2 (F x C y G z ) magnetic ordering until to the Néel temperature . However, Yin et al reveals two spin reorientation points in the single crystal of ErCrO 3 obtained by high-temperature flux method, which could also be observed in the field cooling magnetization curve at 6 K. This result should be ascribed to the antiferromagnetic arrangement of Er 3+ spin ordering, which is reported to be ordered at about 4.3 K according to neutron diffraction . The calculated Weiss constant for ErCrO 3 is 213.18 K, which is 35 K for the samples obtained via high-temperature solid state method …”

Preparation and Gas Sensing Characteristics of Nanoparticulate p‐Type Semiconducting LnFeO3 and LnCrO3 Materials

“…The rare-earth perovskites (LnBO 3 ) that contain transition metal ions (B) show a range of interesting electrical properties. They are used as materials for catalysis, [2,3] photocatalysis, [4] fuel cells, [5,6] magneto-optics, [7,8] and in spin valves. [9] A number of perovskite oxides have been proposed earlier as gas-sensor materials because of their stability at high temperatures and in chemically aggressive atmospheres.…”

Preparation, surface state and band structure studies of SrTi(1−x)Fe(x)O(3−δ) (x=0–1) perovskite-type nano structure by X-ray and ultraviolet photoelectron spectroscopy

“…Perovskite structure material are used in a wide range of applications such as catalysis [1,4], photocatalysis [5,6], fuel cells [7], magnetooptics [8,9], and in spin valves [10]. The stability of perovskite materials at high temperatures and in chemically aggressive atmospheres has made these materials such as SrTiO 3 and BrTiO 3 suitable as gassensor materials [11,12].…”