Structural and magnetic resonance investigations of CuCr2S4 nanoclusters and nanocrystals

Тип публикации: статья из журнала

Год издания: 2014

Идентификатор DOI: 10.1063/1.4891993

Ключевые слова: Chromium compounds, Freezing, Magnetic moments, Magnetic resonance, Nanocrystals, Transmission electron microscopy, Blocking temperature, Low-field resonances, Magnetic dipolar field, Nanocrystalline particle, Resonance measurement, Resonance spectrum, Room temperature, Wide frequency range, Nanoclusters

Аннотация: Nanoclusters and nanocrystals of the room temperature magnetic spinel CuCr2S4 synthesized using a facile solution-based method have been examined by transmission electron microscopy, magnetic measurements, and magnetic resonance over a wide frequency range 9.6-80 GHz and at temperatures down to 4.2 K. Decreasing of the resonance field and broadening of the resonance lines below 50K for both samples are due to the freezing of magnetic moments of nanocubes and nanocrystalline particles constituting nanoclusters. The effective fields of averaged magnetic anisotropy congruent to 2.4 kOe are similar for both nanopowder samples as estimated from resonance measurements at T = 4.2 K. An additional blocking temperature T-b congruent to 300K appears in nanoclusters due to freezing of the magnetic moment of the entire cluster as a whole. Below this blocking temperature, the magnetic dipolar field acting in boundary areas of interacting constituent nanocrystals is responsible for the additional low-field resonance line observed in the resonance spectra of nanoclusters at X-band. (C) 2014 AIP Publishing LLC.

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Издание

Журнал: JOURNAL OF APPLIED PHYSICS

Выпуск журнала: Vol. 116, Is. 5

ISSN журнала: 00218979

Место издания: MELVILLE

Издатель: AMER INST PHYSICS

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