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10 items by relevance
1 Book chapter

Superparamagnetic particles

Mørup, Steen; Hansen, Mikkel Fougt

Handbook of Magnetism and Advanced Magnetic Materials — 2007, pp. 2159-2176

Year: 2007

Language: English

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2 Journal article

Superparamagnetic relaxation of weakly interacting particles

Mørup, Steen; Tronc, Elisabeth

Physical Review Letters — 1994, Volume 72, Issue 20, pp. 3278-3281

The influence of particle interactions on the superparamagnetic relaxation time has been studied by Mossbauer spectroscopy in samples of maghemite (gamma-Fe2O3) particles with different particle sizes and particle separations. It is found that the relaxation time decreases with decreasing particle

Year: 1994

Language: English

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lmj kn haedicfg obp
3 Book chapter

Studies of Superparamagnetism in Samples of Ultrafine Particles

Mørup, Steen

Nanomagnetism — 1993, pp. 93-99

media ultrafine magnetic particles are applied, for example, in ferrofluids which are stable suspensions of magnetic particles in liquids [1]. Ferrofluids are widely applied for damping and cooling in loudspeakers and for vacuum seals for rotary shafts. More than 300 patents on various applications

Year: 1993

Language: English

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4 Journal article

Superparamagnetic relaxation in alpha-Fe particles

Bødker, Franz; Mørup, Steen; Pedersen, Michael Stanley; Svedlindh, P.; Jonsson, G.T.; Garcia-Palacios, J.L.; et al. (1 more)

Journal of Magnetism and Magnetic Materials — 1998, Volume 177, pp. 925-927

The superparamagnetic relaxation time of carbon-supported alpha-Fe particles with an average size of 3.0 Mm has been studied over a large temperature range by the use of Mossbauer spectroscopy combined with AC and DC magnetization measurements. It is found that the relaxation time varies

Year: 1998

Language: English

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5 Conference paper

Effect of Inter-Particle Interactions on the Superparamagnetic Relaxation Time in Ferrofluids

Jiang, Jianzhong; Mørup, Steen; Svedlindh, P.

Proc. Icame'95 — 1996, pp. 524-532

The influence of dipolar interactions in a frozen ferrofluid consisting of maghemite particles has been studied by Mossbauer spectroscopy in the temperature range from 60 to 200 K. Four samples with volume concentrations ranging from 0.3 to 17.7 % have been investigated. The superparamagnetic

Year: 1996

Language: English

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6 Conference paper

Influence of Inter-Particle Interactions on the Superparamagnetic Relaxation Time in a Sample of Nano-Sized Feroxyhyte Particles

Meaz, T; Koch, C. Bender; Mørup, Steen

Proc. Icame'95 — 1996, pp. 525-528

Ultrafine particles of feroxyhyte (delta-FeOOH) have been studied by Mossbauer spectroscopy. Coating of the particles with oleic acid results in a decrease of the superparamagnetic blocking temperature, whereas pressing the particles with a uniaxial pressure of 1.3 GPa leads to an increase

Year: 1996

Language: English

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7 Journal article

Superparamagnetic amorphous Fe1−xCx alloy particles in a ferrofluid

Mørup, S.; Bødker, F.; Van Wonterghem, J.; Madsen, M. B.; Bentzon, M. D.

Hyperfine Interactions — 1989, Volume 51, Issue 1, pp. 1071-1077

A ferrofluid with ultrasmall magnetic particles (d≅3.3 nm) of amorphous Fe1−xCx has been studied by Mössbauer spectroscopy and electron microscopy. The values of the particle size estimated by the two methods are in good agreement. The magnetic anisotropy energy constant,K=(1.0±0.3)×105 J m−3 has

Year: 1989

Language: English

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8 Journal article

MODIFIED THEORY FOR MÖSSBAUER SPECTRA OF SUPERPARAMAGNETIC PARTICLES : APPLICATION TO Fe3O4

MØRUP, S.; TOPSØE, H.; LIPKA, J.

Le Journal De Physique Colloques — 1976, Volume 37, Issue C6, pp. C6-287-C6-290

Year: 1976

Language: Undetermined

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