Surface spin-glass-like behavior of monodispersed superparamagnetic Mn 0.5Zn 0.5Fe 2O 4 magnetic fluid

Kinnari Parekh, L. Almásy, Hyo Sook Lee, R. V. Upadhyay

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Zero field cooled dc-magnetization measurements of monodispersed Mn 0.5Zn 0.5Fe 2O 4 nanoparticles dispersed in kerosene exhibit two transitions at low temperatures. These transitions correspond to (i) the superparamagnetic to blocked superparamagnetic and (ii) the blocked superparamagnetic to surface spin-glass like/quantum superparamagnetic state upon lowering the temperature. The existence of a disorder surface is confirmed by recording small-angle neutron scattering data below and above the Curie temperature. Magnetic relaxation analysis shows a plateau at low temperature (below 5 K) with a slight minimum at 3 K, which is a characteristic of the surface spin-glass-like state. This is analyzed considering the energy distribution n(E)1/E. The existence of surface disorder dominates at low temperature and mimics the transition from superparamagnetic to quantum superparamagnetic states.

Original languageEnglish
Pages (from-to)223-228
Number of pages6
JournalApplied Physics A: Materials Science and Processing
Volume106
Issue number1
DOIs
Publication statusPublished - Jan 2012

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Spin glass
Magnetic fluids
spin glass
fluids
disorders
Magnetic relaxation
kerosene
Temperature
magnetic relaxation
Kerosene
Curie temperature
Neutron scattering
plateaus
Magnetization
energy distribution
neutron scattering
recording
Nanoparticles
nanoparticles
magnetization

ASJC Scopus subject areas

  • Materials Science(all)
  • Chemistry(all)

Cite this

Surface spin-glass-like behavior of monodispersed superparamagnetic Mn 0.5Zn 0.5Fe 2O 4 magnetic fluid. / Parekh, Kinnari; Almásy, L.; Lee, Hyo Sook; Upadhyay, R. V.

In: Applied Physics A: Materials Science and Processing, Vol. 106, No. 1, 01.2012, p. 223-228.

Research output: Contribution to journalArticle

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