Тип публикации: статья из журнала (материалы конференций, опубликованные в журналах)
Конференция: Joint MMM-Intermag Conference; Chicago, IL; Chicago, IL
Год издания: 2013
Идентификатор DOI: 10.1063/1.4794361
Ключевые слова: Granular layer, Granular media, Granule diameter, Nano-granular, Nanogranular films, Percolation thresholds, Single layer films, Superparamagnetics, Cobalt, Exchange interactions, Ferromagnetic materials, Ferromagnetism, Granulation, Magnetic multilayers, Magnetic properties, Multilayer films, Semiconducting silicon, Silicon, Superparamagnetism, Multilayers
Аннотация: Magnetic properties of multilayers, consisting of nanogranular (Co40Fe40B20)(50)(SiO2)(50) layers as thin as magnetic granule diameter alternating the alpha-Si: H or SiO2 layers and the single layer film (Co40Fe40B20)(50)(SiO2)(50) with the thickness much larger than the magnetic granule diameter are reported and compared. The thicПоказать полностьюk single layer film is ferromagnetic but the multilayer film with the ultrathin granular layers and SiO2 spacer is superparamagnetic. This is interpreted as the result of increasing percolation threshold in the 2D granular media above 50% concentration of magnetic granules in the multilayer with the nonmagnetic and dielectric SiO2 spacer. The multilayer with the alpha-Si: H spacer is superparamagnetic at 300 K but it becomes ferromagnetic, when temperature is below 250 K. It is assumed to be resulted from the exchange interaction of magnetic granules through the semiconductor alpha-Si: H layers. The value of exchange interaction through the semiconductor spacer is estimated. (C) 2013 American Institute of Physics.
Журнал: JOURNAL OF APPLIED PHYSICS
Выпуск журнала: Vol. 113, Is. 17
ISSN журнала: 00218979
Место издания: MELVILLE
Издатель: AMER INST PHYSICS