Origin of coercivity of Ca-Ge substituted epitaxial YIG crystals

M. Pardavi-Horvath, A. Cziráki, I. Fellegvàri, G. Vértesy, J. Vandlik, B. Keszei

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

LPE grown, substituted YIG crystals have coercivities (H c) in the 10 –1Oe range, depending on compositions and growth conditions. Dislocations, inclusions and surfaces cannot be fully responsible for the observed H c. TEM investigations of CaGeSmYIG films have revealed a periodically modulated stress field that - via magnetostrictive stresses - may explain the FMR line broadening and the measured H c. Stresses of 107 dyne cm -2 and Δa/a ~10 -5with a periodicity of 500 A produce H c ~ 1 Oe corresponding to a periodic fluctuation of Sm or Ca-Ge content by 1-3%. The mechanism, thought to be the spinodal decomposition of the garnet, causes FMR line broadening up to 200–300 Oe, i.e. more than the relaxation of Sm 3+ions.

Original languageEnglish
Pages (from-to)1123-1125
Number of pages3
JournalIEEE Transactions on Magnetics
Volume20
Issue number5
DOIs
Publication statusPublished - 1984

Fingerprint

Coercive force
Ferromagnetic resonance
Crystals
Spinodal decomposition
Garnets
Ions
Transmission electron microscopy
Chemical analysis

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Cite this

Origin of coercivity of Ca-Ge substituted epitaxial YIG crystals. / Pardavi-Horvath, M.; Cziráki, A.; Fellegvàri, I.; Vértesy, G.; Vandlik, J.; Keszei, B.

In: IEEE Transactions on Magnetics, Vol. 20, No. 5, 1984, p. 1123-1125.

Research output: Contribution to journalArticle

Pardavi-Horvath, M. ; Cziráki, A. ; Fellegvàri, I. ; Vértesy, G. ; Vandlik, J. ; Keszei, B. / Origin of coercivity of Ca-Ge substituted epitaxial YIG crystals. In: IEEE Transactions on Magnetics. 1984 ; Vol. 20, No. 5. pp. 1123-1125.
@article{9630ecf98db046c89cd12186abe83377,
title = "Origin of coercivity of Ca-Ge substituted epitaxial YIG crystals",
abstract = "LPE grown, substituted YIG crystals have coercivities (H c) in the 10 –1Oe range, depending on compositions and growth conditions. Dislocations, inclusions and surfaces cannot be fully responsible for the observed H c. TEM investigations of CaGeSmYIG films have revealed a periodically modulated stress field that - via magnetostrictive stresses - may explain the FMR line broadening and the measured H c. Stresses of 107 dyne cm -2 and Δa/a ~10 -5with a periodicity of 500 A produce H c ~ 1 Oe corresponding to a periodic fluctuation of Sm or Ca-Ge content by 1-3{\%}. The mechanism, thought to be the spinodal decomposition of the garnet, causes FMR line broadening up to 200–300 Oe, i.e. more than the relaxation of Sm 3+ions.",
author = "M. Pardavi-Horvath and A. Czir{\'a}ki and I. Fellegv{\`a}ri and G. V{\'e}rtesy and J. Vandlik and B. Keszei",
year = "1984",
doi = "10.1109/TMAG.1984.1063147",
language = "English",
volume = "20",
pages = "1123--1125",
journal = "IEEE Transactions on Magnetics",
issn = "0018-9464",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "5",

}

TY - JOUR

T1 - Origin of coercivity of Ca-Ge substituted epitaxial YIG crystals

AU - Pardavi-Horvath, M.

AU - Cziráki, A.

AU - Fellegvàri, I.

AU - Vértesy, G.

AU - Vandlik, J.

AU - Keszei, B.

PY - 1984

Y1 - 1984

N2 - LPE grown, substituted YIG crystals have coercivities (H c) in the 10 –1Oe range, depending on compositions and growth conditions. Dislocations, inclusions and surfaces cannot be fully responsible for the observed H c. TEM investigations of CaGeSmYIG films have revealed a periodically modulated stress field that - via magnetostrictive stresses - may explain the FMR line broadening and the measured H c. Stresses of 107 dyne cm -2 and Δa/a ~10 -5with a periodicity of 500 A produce H c ~ 1 Oe corresponding to a periodic fluctuation of Sm or Ca-Ge content by 1-3%. The mechanism, thought to be the spinodal decomposition of the garnet, causes FMR line broadening up to 200–300 Oe, i.e. more than the relaxation of Sm 3+ions.

AB - LPE grown, substituted YIG crystals have coercivities (H c) in the 10 –1Oe range, depending on compositions and growth conditions. Dislocations, inclusions and surfaces cannot be fully responsible for the observed H c. TEM investigations of CaGeSmYIG films have revealed a periodically modulated stress field that - via magnetostrictive stresses - may explain the FMR line broadening and the measured H c. Stresses of 107 dyne cm -2 and Δa/a ~10 -5with a periodicity of 500 A produce H c ~ 1 Oe corresponding to a periodic fluctuation of Sm or Ca-Ge content by 1-3%. The mechanism, thought to be the spinodal decomposition of the garnet, causes FMR line broadening up to 200–300 Oe, i.e. more than the relaxation of Sm 3+ions.

UR - http://www.scopus.com/inward/record.url?scp=0006170635&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0006170635&partnerID=8YFLogxK

U2 - 10.1109/TMAG.1984.1063147

DO - 10.1109/TMAG.1984.1063147

M3 - Article

AN - SCOPUS:0006170635

VL - 20

SP - 1123

EP - 1125

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

SN - 0018-9464

IS - 5

ER -