Structural and magnetic resonance investigations of CuCr{sub 2}S{sub 4} nanoclusters and nanocrystals

Journal Article · Thu Aug 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4891993· OSTI ID:22314563

Zharkov, S. M.; Velikanov, D. A. ^[1]; Vorotynov, A. M.; Tugarinov, V. I.; Abramova, G. M. ^[1]; Zeer, G. M. ^[2]; Ramasamy, K.; Gupta, A. ^[3]

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1. Kirensky Institute of Physics, SB RAS, Akademgorodok, Krasnoyarsk 660036 (Russian Federation)
2. Siberian Federal University, 79 Svobodny prosp., Krasnoyarsk 660041 (Russian Federation)
3. MINT Center, The University of Alabama, Tuscaloosa, Alabama 35487 (United States)

Nanoclusters and nanocrystals of the room temperature magnetic spinel CuCr{sub 2}S{sub 4} 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 50 K 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 〈H{sub A}〉≅ 2.4 kOe are similar for both nanopowder samples as estimated from resonance measurements at T = 4.2 K. An additional blocking temperature T{sub b} ≅ 300 K 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.

• OSTI ID: 22314563
• Journal Information: Journal of Applied Physics, Vol. 116, Issue 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHANNELING
FREEZING
GHZ RANGE
MAGNETIC MOMENTS
MAGNETIC RESONANCE
MATHEMATICAL SOLUTIONS
NANOSTRUCTURES
POTASSIUM 50
POWDERS
SPINELS
TEMPERATURE RANGE 0273-0400 K
TRANSMISSION ELECTRON MICROSCOPY