Spin-glass-like ordering of the magnetic moments of interacting nanosized maghemite particles

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Abstract

Samples of interacting nanosized maghemite particles have been studied by Mössbauer spectroscopy and magnetization measurements. The apparent blocking temperatures obtained from Mössbauer spectroscopy and zero-field-cooled magnetization curves are nearly identical, but the values obtained from measurements of the decay of remanence are much lower. These results are not in accordance with the Néel model for superparamagnetic relaxation, but can be explained by the formation of an ordered spin-glass-like state at low temperatures. At a critical temperature a transition to a superparamagnetic state takes place. By varying the average interparticle distance it is possible to change the ordering temperature.
Original languageEnglish
JournalPhysical Review B
Volume52
Issue number1
Pages (from-to)287-294
ISSN2469-9950
DOIs
Publication statusPublished - 1995

Bibliographical note

Copyright (1995) by the American Physical Society.

Keywords

  • Relaxation
  • Superparamagnetic model
  • Random anisotropy
  • Dipole interactions
  • Susceptibility phenomena
  • System
  • Mossbauer-spectroscopy
  • Alpha-Fe
  • Size
  • Field-depemdence

Cite this

@article{f0e2a509d47140189a981f04ea5744ff,
title = "Spin-glass-like ordering of the magnetic moments of interacting nanosized maghemite particles",
abstract = "Samples of interacting nanosized maghemite particles have been studied by M{\"o}ssbauer spectroscopy and magnetization measurements. The apparent blocking temperatures obtained from M{\"o}ssbauer spectroscopy and zero-field-cooled magnetization curves are nearly identical, but the values obtained from measurements of the decay of remanence are much lower. These results are not in accordance with the N{\'e}el model for superparamagnetic relaxation, but can be explained by the formation of an ordered spin-glass-like state at low temperatures. At a critical temperature a transition to a superparamagnetic state takes place. By varying the average interparticle distance it is possible to change the ordering temperature.",
keywords = "Relaxation, Superparamagnetic model, Random anisotropy, Dipole interactions, Susceptibility phenomena, System, Mossbauer-spectroscopy, Alpha-Fe, Size, Field-depemdence",
author = "Steen M{\o}rup and Franz B{\o}dker and Hendriksen, {Peter Vang} and S{\o}ren Linderoth",
note = "Copyright (1995) by the American Physical Society.",
year = "1995",
doi = "10.1103/PhysRevB.52.287",
language = "English",
volume = "52",
pages = "287--294",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "1098-0121",
publisher = "American Physical Society",
number = "1",

}

Spin-glass-like ordering of the magnetic moments of interacting nanosized maghemite particles. / Mørup, Steen; Bødker, Franz; Hendriksen, Peter Vang; Linderoth, Søren.

In: Physical Review B, Vol. 52, No. 1, 1995, p. 287-294.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Spin-glass-like ordering of the magnetic moments of interacting nanosized maghemite particles

AU - Mørup, Steen

AU - Bødker, Franz

AU - Hendriksen, Peter Vang

AU - Linderoth, Søren

N1 - Copyright (1995) by the American Physical Society.

PY - 1995

Y1 - 1995

N2 - Samples of interacting nanosized maghemite particles have been studied by Mössbauer spectroscopy and magnetization measurements. The apparent blocking temperatures obtained from Mössbauer spectroscopy and zero-field-cooled magnetization curves are nearly identical, but the values obtained from measurements of the decay of remanence are much lower. These results are not in accordance with the Néel model for superparamagnetic relaxation, but can be explained by the formation of an ordered spin-glass-like state at low temperatures. At a critical temperature a transition to a superparamagnetic state takes place. By varying the average interparticle distance it is possible to change the ordering temperature.

AB - Samples of interacting nanosized maghemite particles have been studied by Mössbauer spectroscopy and magnetization measurements. The apparent blocking temperatures obtained from Mössbauer spectroscopy and zero-field-cooled magnetization curves are nearly identical, but the values obtained from measurements of the decay of remanence are much lower. These results are not in accordance with the Néel model for superparamagnetic relaxation, but can be explained by the formation of an ordered spin-glass-like state at low temperatures. At a critical temperature a transition to a superparamagnetic state takes place. By varying the average interparticle distance it is possible to change the ordering temperature.

KW - Relaxation

KW - Superparamagnetic model

KW - Random anisotropy

KW - Dipole interactions

KW - Susceptibility phenomena

KW - System

KW - Mossbauer-spectroscopy

KW - Alpha-Fe

KW - Size

KW - Field-depemdence

U2 - 10.1103/PhysRevB.52.287

DO - 10.1103/PhysRevB.52.287

M3 - Journal article

VL - 52

SP - 287

EP - 294

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 1098-0121

IS - 1

ER -