Magnetic and resonance properties of multilayer (Gd/Si/Co/Si)ₙ films

Presented are the experimental investigation results of magnetic static and resonance properties of multilayer magnetic films in the system of 4f-3d elements separated by a semiconductor interlayer. Effects of temperature and magnetic field on interlayer coupling are detected. The role of the biquadratic exchange in formation of magnetic state in the whole system is established.Представлены результаты экспериментального исследования статических и резонансных магнитных свойств многослойных магнитных пленок в системе элементов 4f-3d, разделенных полупроводниковым промежуточным слоем. Обнаружено влияние температуры и магнитного поля на межслоевое взаимодействие. Установлена роль биквадратного обмена в формировании магнитного состояния системы как целого.Представлено результати експериментального досліджєння статичних та резонансних магнітних властивостей багатошарових магнітних плівок в системі елементів 4f-3d, розділених напівпровідниковим проміжним шаром. Виявлено вплив температури та магнітного поля на міжшарову взаємодію. Встановлено роль біквадратного обміну у формуванні магнітного стану системи як цілого

Contribution of Co 3+ ions to the high-temperature magnetic and electrical properties of GdCoO 3

The temperature dependence of the static magnetization of polycrystalline rare-earth cobaltite GdCoO 3 is measured in the temperature range 2-800 K. The magnetic behaviors of GdCoO 3 and Gd 3+ are found to be different at temperatures above room temperature, which is caused by the appearance of a contribution from Co 3+ ions at high temperatures. The temperature dependence of the magnetic susceptibility of GdCoO 3 is determined by the magnetization of rare-earth gadolinium ions and the additional paramagnetic contribution induced by the thermally excited magnetic terms of Co 3+ ions. The LDA + GTB method is used to calculate the electronic structure of GdCoO 3 in the temperature range 0-300 K with allowance for strong electron correlations. The energy spectrum of GdCoO 3 is found to have intragap states that decrease the dielectric gap width with increasing temperature. � Pleiades Publishing, Inc., 2012

Antiferromagnetic ordering in REM cobaltite GdCoO 3

Temperature and magnetic-field dependences of the static magnetization of polycrystalline cobaltite GdCoO 3 have been measured. The magnetic properties of the GdCoO 3 sample have been studied in the paramagnetic and antiferromagnetic states. The magnetic phase diagram has been constructed. The exchange field between the Gd-Gd sublattices and the anisotropy field have been estimated. Zapotitlán 2012 Pleiades Publishing, Ltd