Spin dynamics of amorphous Fe0.86B0.14

J. A. Fernandez-Baca; J. W. Lynn; J. J. Rhyne; G. E. Fish

doi:10.1016/S0378-4363(86)80019-5

Spin dynamics of amorphous Fe_0.86B_0.14

J. A. Fernandez-Baca, J. W. Lynn, J. J. Rhyne, G. E. Fish

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Abstract

A high resolution neutron inelastic scattering experiment has been performed in order to study the spin dynamics of amorphous Fe_0.86B_0.14, which exhibits Invar properties. Spin waves were observed in the wave-vector range 0.05 ≦ q ≦ 0.13 Å^-1, at temperatures between 0.53 and 0.93T_c. The spin-wave energies were well described by a quadratic dispersion relation and the stiffness constant renormalized with temperature as D = D(0)[1 - a(T/T_c)^{5 2}]. The q and T dependence of the spin-wave intrinsic linewidths was confirmed to be consistent with the G{cyrillic}αq⁴[Tln(kT/E)]² form predicted from the two magnon interaction theory of a Heisenberg ferromagnet. There are no anomalies in the spin-wave lifetimes at long wavelengths which appear to relate to the Invar effect seen in Fe_0.86B_0.14.

Original language	English
Pages (from-to)	53-55
Number of pages	3
Journal	Physica B+C
Volume	136
Issue number	1-3
DOIs	https://doi.org/10.1016/S0378-4363(86)80019-5
State	Published - 1986
Externally published	Yes

Funding

The research at the University of Maryland was supported by the National Science Foundation, DMR 83-19936. The research at Oak Ridge was sponsored by the U.S. Department of Energy under contract DE-AC05-840R21400 with Martin Marietta Energy Systems, Inc.

Funders	Funder number
National Science Foundation	DMR 83-19936
U.S. Department of Energy	DE-AC05-840R21400

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10.1016/S0378-4363(86)80019-5

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title = "Spin dynamics of amorphous Fe0.86B0.14",

abstract = "A high resolution neutron inelastic scattering experiment has been performed in order to study the spin dynamics of amorphous Fe0.86B0.14, which exhibits Invar properties. Spin waves were observed in the wave-vector range 0.05 ≦ q ≦ 0.13 {\AA}-1, at temperatures between 0.53 and 0.93Tc. The spin-wave energies were well described by a quadratic dispersion relation and the stiffness constant renormalized with temperature as D = D(0)[1 - a(T/Tc) 5 2]. The q and T dependence of the spin-wave intrinsic linewidths was confirmed to be consistent with the G{cyrillic}αq4[Tln(kT/E)]2 form predicted from the two magnon interaction theory of a Heisenberg ferromagnet. There are no anomalies in the spin-wave lifetimes at long wavelengths which appear to relate to the Invar effect seen in Fe0.86B0.14.",

author = "Fernandez-Baca, {J. A.} and Lynn, {J. W.} and Rhyne, {J. J.} and Fish, {G. E.}",

year = "1986",

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journal = "Physica B+C",

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T1 - Spin dynamics of amorphous Fe0.86B0.14

AU - Fernandez-Baca, J. A.

AU - Lynn, J. W.

AU - Rhyne, J. J.

AU - Fish, G. E.

PY - 1986

Y1 - 1986

N2 - A high resolution neutron inelastic scattering experiment has been performed in order to study the spin dynamics of amorphous Fe0.86B0.14, which exhibits Invar properties. Spin waves were observed in the wave-vector range 0.05 ≦ q ≦ 0.13 Å-1, at temperatures between 0.53 and 0.93Tc. The spin-wave energies were well described by a quadratic dispersion relation and the stiffness constant renormalized with temperature as D = D(0)[1 - a(T/Tc) 5 2]. The q and T dependence of the spin-wave intrinsic linewidths was confirmed to be consistent with the G{cyrillic}αq4[Tln(kT/E)]2 form predicted from the two magnon interaction theory of a Heisenberg ferromagnet. There are no anomalies in the spin-wave lifetimes at long wavelengths which appear to relate to the Invar effect seen in Fe0.86B0.14.

AB - A high resolution neutron inelastic scattering experiment has been performed in order to study the spin dynamics of amorphous Fe0.86B0.14, which exhibits Invar properties. Spin waves were observed in the wave-vector range 0.05 ≦ q ≦ 0.13 Å-1, at temperatures between 0.53 and 0.93Tc. The spin-wave energies were well described by a quadratic dispersion relation and the stiffness constant renormalized with temperature as D = D(0)[1 - a(T/Tc) 5 2]. The q and T dependence of the spin-wave intrinsic linewidths was confirmed to be consistent with the G{cyrillic}αq4[Tln(kT/E)]2 form predicted from the two magnon interaction theory of a Heisenberg ferromagnet. There are no anomalies in the spin-wave lifetimes at long wavelengths which appear to relate to the Invar effect seen in Fe0.86B0.14.

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ER -

Spin dynamics of amorphous Fe_0.86B_0.14

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