Photoinduced magnetic superstructure in FeBO3:Ni

Dynamic magnetic structure induced by light in FeBO₃:Ni has been studied magneto-optically. Spatial distribution of ferromagnetic vector has been found to be periodical; ferromagnetic vector oscillations obey the quasi-harmonical law with the wave length λ ～ 100μ; the oscillation amplitude is ～ 10° in basal plane and ～0.08° normally to it, so that the hodograph of the ferromagnetic vector is an ellipse with axes ratio being about 100. The direction of propagation of magnetic wave excitations has been ascertained to be determined by the crystal structure only. An average direction of the ferromagnetic vector is deviated from the wave vector of the oscillations.     

Magnetic resonance of the M x Mn1 ? x S compounds (M = Cu, Cr)

Cation-substituted manganese monosulfide M _x Mn_{1 ? x} S (M = Cu, Cr) has been investigated using the electron paramagnetic resonance method. The temperature and concentration dependences of the width and shape of the magnetic resonance line have been considered using the Van Vleck method of moments. It has been shown that, if the Mn²⁺ ions are substituted by the copper and chromium ions, the change of the effective exchange interaction in the system that substantially affects the magnetic resonance spectra takes place.     

Pairwise Interactions of Fe3+ Ions in InBO3 Crystals

Measurements of the electron paramagnetic resonance (EPR) of Fe³⁺ ion pairs in InBO₃ crystals are conducted. Some parts of the procedure of spectrum identification without measuring the temperature dependence of the resonant line intensities have been developed. Experimental curves of the second- and fourth-order axial Hamiltonian constants D _S and (a – F)_S, respectively, of the total spin number S are constructed. The single-ion second-order axial constant D _c is well described by a linear dependence on S. The constant (a – F)_S has a quadratic dependence.     

Electron Paramagnetic Resonance of Cr3+ Ions in Single Crystals of Yttrium Aluminum Borate YAl3(BO3)4

Physics of the Solid State - Single crystal of yttrium aluminum borate YAl3(BO3)4 doped with chromium ions (1 at %) was studied using electron paramagnetic resonance spectroscopy. It is shown that...     

Electron paramagnetic resonance of Cr<Superscript>3+</Superscript> ions in ABO<Subscript>3</Subscript> (A = Sc,Lu, In) diamagnetic crystals

A magnetic resonance method is applied to the investigation of a number of isostructural diamagnetic compounds ABO₃ (A = Sc, Lu, In) with small additions of Cr³⁺ ions (S = 3/2) sufficient to observe single-ion spectra. It is shown that the resonance spectra for isolated Cr³⁺ ions can be described to a good accuracy by the ordinary axial spin Hamiltonian for 3d ions in octahedral oxygen environment. The parameters of the spin Hamiltonian are determined. It is established that Cr³⁺ ions in these crystals are characterized by easy-axis-type anisotropy.     

Magnetic and magneto-optical properties of ion-synthesized cobalt nanoparticles in silicon oxide

The magnetic and magneto-optical properties of ion-synthesized cobalt nanoparticles in the amorphous silicon oxide matrix are investigated as a function of the implantation dose. The analysis of the field dependences of the magnetization and the magneto-optical Faraday and Kerr effects demonstrates that, as the ion implantation dose increases, the superparamagnetic behavior of an ensemble of cobalt nanoparticles at room temperature gives way to a ferromagnetic response with the anisotropy characteristic of a thin magnetic film. The magnetization curves for the superparamagnetic and ferromagnetic ensembles of cobalt nanoparticles are simulated to determine their average sizes and the filling density in the irradiated layer of the silicon dioxide matrix. It is revealed that the spectral dependences of the Faraday and Kerr effects for ion-synthesized cobalt nanoparticles differ substantially from those for continuous cobalt films due to the localized excitations of free electrons in the nanoparticles.     

Exchange Interactions in the Cr3+–Cr3+ Ion Pair in the ABO3 (A = Ga,In, Sc) Diamagnetic Matrix

Physics of the Solid State - The exchange interactions in the Cr3+–Cr3+ ion pairs in the isostructural ABO3 (A = Ga, In, Sc) diamagnetic compounds have been examined using the magnetic...     

Crystal and magnetic properties of the new copper-sodium borate CuNaB3O6 · 0.842H2O

A new compound CuNaB₃O₆ · 0.842H₂O was grown for the first time. Its crystal structure, magnetic susceptibility, and magnetic resonance properties are presented. It was proposed that CuNaB₃O₆ · 0.842H₂O is a spin-Peierls magnet with the transition temperature T _SP ～ 128 K and a ladder spin structure. The possibility of a structural phase transition at T < T _SP is predicted.