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Магнитные свойства, магнетокалорический эффект и критическое поведение аморфных лент Gd - Co - Ge

Ч. Г. Чжэн, Ю. Х. Ли, А. Хе, Я. Можаривски, Х. Я. Юй, Д. Ц. Цзен

Аннотация


Исследовано влияние структурного разупорядочения на магнитные свойства и магнетокалорический эффект аморфных сплавов (Gd4Co3)1-xGex (x = 0; 0,05; 0,10; 0,15). Определена структура лент после закалки из жидкого состояния на рентгеновском дифрактометре. Проведен термический анализ на дифференциальном сканирующем калориметре. Установлена температура начала кристаллизации. Измерены магнитные свойства в системе PPMS-9, установлена температурная зависимость намагниченности и температура точки Кюри. Опробованы и проанализированы различные модели для описания критических экспонентов магнитных фазовых переходов.

Ключевые слова


критическое поведение; магнетокалорический эффект; критическая экспонента; универсальная кривая; аморфные сплавы; critical behavior; magnetocaloric effect; critical exponent; universal curve; amorphous alloys

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Литература


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DOI: https://doi.org/10.30906/mitom.2019.1.14-22

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