Transverse and longitudinal susceptibilities of a Heisenberg ferromagnet with dipolar forces below Tc

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Transverse and longitudinal susceptibilities of a Heisenberg ferromagnet with dipolar forces below Tc. / Toperverg, Boris P.; Yashenkin, Andrey G.

In: Physical Review B, Vol. 48, No. 22, 1993, p. 16505-16513.

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

BibTeX

@article{0f3620468f3346679bf4239e98a9e4b9,

title = "Transverse and longitudinal susceptibilities of a Heisenberg ferromagnet with dipolar forces below Tc",

abstract = "The frequency dependencies of the uniform transverse and longitudinal susceptibilities of Heisenberg ferromagnets with a dipole-dipole interaction are studied in different temperature regions. Within a broad range of parameters the major contribution to the longitudinal component of the susceptibility, as well as to the dispersion of the fluctuational corrections to the transverse one is found to be the process containing a couple of spin waves in the intermediate state. The ferromagnetic-resonance (FMR) linewidth, which at zero temperature exists due to the quantum fluctuations is calculated. Deviations of the FMR lineshape from a Lorentzian are shown to be rather significant at sufficiently high temperatures. The results obtained within the framework of the developed perturbation theory based on the approach of Vaks, Larkin, and Pikin are generalized for the critical dynamics region. The range of validity of the employed approach is discussed. It is shown that dipole-dipole forces cannot be considered as a perturbation not only in the close vicinity of the Curie point but also at any temperature at low enough frequencies. In particular, the longitudinal susceptibility reveals the infrared discontinuity in the zero-frequency limit.",

author = "Toperverg, {Boris P.} and Yashenkin, {Andrey G.}",

year = "1993",

doi = "10.1103/PhysRevB.48.16505",

language = "English",

volume = "48",

pages = "16505--16513",

journal = "Physical Review B-Condensed Matter",

issn = "1098-0121",

publisher = "American Physical Society",

number = "22",

}

RIS

TY - JOUR

T1 - Transverse and longitudinal susceptibilities of a Heisenberg ferromagnet with dipolar forces below Tc

AU - Toperverg, Boris P.

AU - Yashenkin, Andrey G.

PY - 1993

Y1 - 1993

N2 - The frequency dependencies of the uniform transverse and longitudinal susceptibilities of Heisenberg ferromagnets with a dipole-dipole interaction are studied in different temperature regions. Within a broad range of parameters the major contribution to the longitudinal component of the susceptibility, as well as to the dispersion of the fluctuational corrections to the transverse one is found to be the process containing a couple of spin waves in the intermediate state. The ferromagnetic-resonance (FMR) linewidth, which at zero temperature exists due to the quantum fluctuations is calculated. Deviations of the FMR lineshape from a Lorentzian are shown to be rather significant at sufficiently high temperatures. The results obtained within the framework of the developed perturbation theory based on the approach of Vaks, Larkin, and Pikin are generalized for the critical dynamics region. The range of validity of the employed approach is discussed. It is shown that dipole-dipole forces cannot be considered as a perturbation not only in the close vicinity of the Curie point but also at any temperature at low enough frequencies. In particular, the longitudinal susceptibility reveals the infrared discontinuity in the zero-frequency limit.

AB - The frequency dependencies of the uniform transverse and longitudinal susceptibilities of Heisenberg ferromagnets with a dipole-dipole interaction are studied in different temperature regions. Within a broad range of parameters the major contribution to the longitudinal component of the susceptibility, as well as to the dispersion of the fluctuational corrections to the transverse one is found to be the process containing a couple of spin waves in the intermediate state. The ferromagnetic-resonance (FMR) linewidth, which at zero temperature exists due to the quantum fluctuations is calculated. Deviations of the FMR lineshape from a Lorentzian are shown to be rather significant at sufficiently high temperatures. The results obtained within the framework of the developed perturbation theory based on the approach of Vaks, Larkin, and Pikin are generalized for the critical dynamics region. The range of validity of the employed approach is discussed. It is shown that dipole-dipole forces cannot be considered as a perturbation not only in the close vicinity of the Curie point but also at any temperature at low enough frequencies. In particular, the longitudinal susceptibility reveals the infrared discontinuity in the zero-frequency limit.

UR - http://www.scopus.com/inward/record.url?scp=0001279851&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.48.16505

DO - 10.1103/PhysRevB.48.16505

M3 - Article

AN - SCOPUS:0001279851

VL - 48

SP - 16505

EP - 16513

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 22

ER -

ID: 76976528