Exchange bias in nano-ferrihydrite

Описание

Тип публикации: статья из журнала

Год издания: 2016

Идентификатор DOI: 10.1063/1.4967912

Ключевые слова: Anisotropy, Cooling systems, Hysteresis, Magnetic fields, Magnetic materials, Magnetism, Nanomagnetics, Nanoparticles, Particle size, Characteristic value, Exchange bias, Exchange bias effects, External magnetic field, Field cooling, High anisotropy, Minor hysteresis loop, Superparamagnetic blocking, Hysteresis loops

Аннотация: We report the results of investigations of the effect of cooling in an external magnetic field starting from the temperature over superparamagnetic blocking temperature TB on the shift of magnetic hysteresis loops in systems of ferrihydrite nanoparticles from similar to 2.5 to similar to 5 nm in size with different TB values. In viПоказать полностьюrtue of high anisotropy fields of ferrihydrite nanoparticles and open hysteresis loops in the range of experimentally attainable magnetic fields, the shape of hysteresis loops of such objects in the field-cooling mode is influenced by the minor hysteresis loop effect. A technique is proposed for distinguishing the exchange bias effect among the effects related to the minor hysteresis loops caused by high anisotropy fields of ferrihydrite particles. The exchange bias in ferrihydrite is stably observed for particles not less than 3 nm in size or with TB over 40 K, and its characteristic value increases with the particle size. Published by AIP Publishing.

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Издание

Журнал: JOURNAL OF APPLIED PHYSICS

Выпуск журнала: Vol. 120, Is. 18

ISSN журнала: 00218979

Место издания: MELVILLE

Издатель: AMER INST PHYSICS

Авторы

  • Balaev D.A. (Siberian Federal University)
  • Krasikov A.A. (Siberian Federal University)
  • Dubrovskiy A.A. (Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Popkov S.I. (Siberian Federal University)
  • Stolyar S.V. (Siberian Federal University)
  • Iskhakov R.S. (Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Yaroslavtsev R.N. (Siberian Federal University)
  • Ladygina V.P. (Presidium of Krasnoyarsk Scientific Center,Russian Academy of Sciences,Siberian Branch)

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