Direct measurement of superparamagnetic fluctuations in monodomain fe particles via neutron spin-echo spectroscopy

H. Casalta; P. Schleger; C. Bellouard; M. Hennion; I. Mirebeau; G. Ehlers; B. Farago; J. L. Dormann; M. Kelsch; M. Linde; F. Phillipp

doi:10.1103/PhysRevLett.82.1301

Direct measurement of superparamagnetic fluctuations in monodomain fe particles via neutron spin-echo spectroscopy

H. Casalta, P. Schleger, C. Bellouard, M. Hennion, I. Mirebeau, G. Ehlers, B. Farago, J. L. Dormann, M. Kelsch, M. Linde, F. Phillipp

Research output: Contribution to journal › Article › peer-review

34 Scopus citations

Abstract

Using the technique of neutron spin-echo spectroscopy, we have conducted a direct measurement of the superparamagnetic relaxation of nanoscale, magnetic monodomain iron particles in the time range between 0.01 and 160 nsec and for momentum transfers q between 0.035 and 0.15Å^-1. Using a phenomenological model which includes the effect of a particle size distribution, we are able to determine the temperature T and q dependence of the longitudinal superspin relaxation time spanning 4 orders of magnitude. We find that for T≲40K, interparticle correlations affect the longitudinal superspin fluctuations.

Original language	English
Pages (from-to)	1301-1304
Number of pages	4
Journal	Physical Review Letters
Volume	82
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.82.1301
State	Published - 1999
Externally published	Yes

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10.1103/PhysRevLett.82.1301

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title = "Direct measurement of superparamagnetic fluctuations in monodomain fe particles via neutron spin-echo spectroscopy",

abstract = "Using the technique of neutron spin-echo spectroscopy, we have conducted a direct measurement of the superparamagnetic relaxation of nanoscale, magnetic monodomain iron particles in the time range between 0.01 and 160 nsec and for momentum transfers q between 0.035 and 0.15{\AA}-1. Using a phenomenological model which includes the effect of a particle size distribution, we are able to determine the temperature T and q dependence of the longitudinal superspin relaxation time spanning 4 orders of magnitude. We find that for T≲40K, interparticle correlations affect the longitudinal superspin fluctuations.",

author = "H. Casalta and P. Schleger and C. Bellouard and M. Hennion and I. Mirebeau and G. Ehlers and B. Farago and Dormann, {J. L.} and M. Kelsch and M. Linde and F. Phillipp",

year = "1999",

doi = "10.1103/PhysRevLett.82.1301",

language = "English",

volume = "82",

pages = "1301--1304",

journal = "Physical Review Letters",

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TY - JOUR

T1 - Direct measurement of superparamagnetic fluctuations in monodomain fe particles via neutron spin-echo spectroscopy

AU - Casalta, H.

AU - Schleger, P.

AU - Bellouard, C.

AU - Hennion, M.

AU - Mirebeau, I.

AU - Ehlers, G.

AU - Farago, B.

AU - Dormann, J. L.

AU - Kelsch, M.

AU - Linde, M.

AU - Phillipp, F.

PY - 1999

Y1 - 1999

N2 - Using the technique of neutron spin-echo spectroscopy, we have conducted a direct measurement of the superparamagnetic relaxation of nanoscale, magnetic monodomain iron particles in the time range between 0.01 and 160 nsec and for momentum transfers q between 0.035 and 0.15Å-1. Using a phenomenological model which includes the effect of a particle size distribution, we are able to determine the temperature T and q dependence of the longitudinal superspin relaxation time spanning 4 orders of magnitude. We find that for T≲40K, interparticle correlations affect the longitudinal superspin fluctuations.

AB - Using the technique of neutron spin-echo spectroscopy, we have conducted a direct measurement of the superparamagnetic relaxation of nanoscale, magnetic monodomain iron particles in the time range between 0.01 and 160 nsec and for momentum transfers q between 0.035 and 0.15Å-1. Using a phenomenological model which includes the effect of a particle size distribution, we are able to determine the temperature T and q dependence of the longitudinal superspin relaxation time spanning 4 orders of magnitude. We find that for T≲40K, interparticle correlations affect the longitudinal superspin fluctuations.

UR - http://www.scopus.com/inward/record.url?scp=0001235316&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.82.1301

DO - 10.1103/PhysRevLett.82.1301

M3 - Article

AN - SCOPUS:0001235316

SN - 0031-9007

VL - 82

SP - 1301

EP - 1304

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

ER -

Direct measurement of superparamagnetic fluctuations in monodomain fe particles via neutron spin-echo spectroscopy

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