Brillouin light scattering study of the spin dynamics in nanoscale permalloy stripes : Theory and experiment
Identifieur interne : 000521 ( Main/Exploration ); précédent : 000520; suivant : 000522Brillouin light scattering study of the spin dynamics in nanoscale permalloy stripes : Theory and experiment
Auteurs : Hoa T. Nguyen [Canada] ; G. Gubbiotti [Italie] ; M. Madami [Italie] ; S. Tacchi [Italie] ; M. G. Cottam [Canada]Source :
- Microelectronics journal [ 0959-8324 ] ; 2009.
Descripteurs français
- Pascal (Inist)
- Diffusion Brillouin, Spectre Brillouin, Diffusion lumière, Dynamique spin, Echelle nanométrique, Onde spin, Champ extérieur, Champ magnétique, Effet champ magnétique, Aimantation, Modèle microscopique, Dipôle, Hétérogénéité, Etude comparative, Anisotropie magnétique, Nanostructure, Alliage base nickel, Permalloy, Nanomatériau, 6865, 8107B.
English descriptors
- KwdEn :
- Brillouin effect, Brillouin spectra, Comparative study, Dipoles, External fields, Inhomogeneity, Light scattering, Magnetic anisotropy, Magnetic field effects, Magnetic fields, Magnetization, Microscopic model, Nanometer scale, Nanostructured materials, Nanostructures, Nickel base alloys, Permalloy, Spin dynamics, Spin waves.
Abstract
The spin-wave modes in nanoscale permalloy stripes are studied using Brillouin light scattering for the case where an external magnetic field is applied transversely to the length of the stripes. By adjusting the magnitude of this external field, the overall magnetization may be varied between the approximately transverse and longitudinal orientations. The observed spin-wave frequencies are analysed using a recently developed microscopic dipole-exchange theory that is particularly appropriate when the magnetization displays strong spatial inhomogeneity. Comparison between theory and experiment for the two sizes of stripes studied gives fairly good agreement, allowing the magnetic parameters of permalloy to be deduced. A small magnetic anisotropy of the easy-plane type is shown to play an important role.
Affiliations:
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Nguyen</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Physics and Astronomy, University of Western Ontario</s1><s2>London, Ontario, N6A 3K7</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>London, Ontario, N6A 3K7</wicri:noRegion></affiliation></author><author><name sortKey="Gubbiotti, G" sort="Gubbiotti, G" uniqKey="Gubbiotti G" first="G." last="Gubbiotti">G. Gubbiotti</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>CNISM, Dipartimento di Fisica, Università di Perugia, Via A. Pascoli</s1><s2>06123 Perugia</s2><s3>ITA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Italie</country><wicri:noRegion>06123 Perugia</wicri:noRegion></affiliation></author><author><name sortKey="Madami, M" sort="Madami, M" uniqKey="Madami M" first="M." last="Madami">M. Madami</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>CNISM, Dipartimento di Fisica, Università di Perugia, Via A. 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Cottam</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Physics and Astronomy, University of Western Ontario</s1><s2>London, Ontario, N6A 3K7</s2><s3>CAN</s3><sZ>1 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>London, Ontario, N6A 3K7</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Microelectronics journal</title><title level="j" type="abbreviated">Microelectronics j.</title><idno type="ISSN">0959-8324</idno><imprint><date when="2009">2009</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Microelectronics journal</title><title level="j" type="abbreviated">Microelectronics j.</title><idno type="ISSN">0959-8324</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Brillouin effect</term><term>Brillouin spectra</term><term>Comparative study</term><term>Dipoles</term><term>External fields</term><term>Inhomogeneity</term><term>Light scattering</term><term>Magnetic anisotropy</term><term>Magnetic field effects</term><term>Magnetic fields</term><term>Magnetization</term><term>Microscopic model</term><term>Nanometer scale</term><term>Nanostructured materials</term><term>Nanostructures</term><term>Nickel base alloys</term><term>Permalloy</term><term>Spin dynamics</term><term>Spin waves</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Diffusion Brillouin</term><term>Spectre Brillouin</term><term>Diffusion lumière</term><term>Dynamique spin</term><term>Echelle nanométrique</term><term>Onde spin</term><term>Champ extérieur</term><term>Champ magnétique</term><term>Effet champ magnétique</term><term>Aimantation</term><term>Modèle microscopique</term><term>Dipôle</term><term>Hétérogénéité</term><term>Etude comparative</term><term>Anisotropie magnétique</term><term>Nanostructure</term><term>Alliage base nickel</term><term>Permalloy</term><term>Nanomatériau</term><term>6865</term><term>8107B</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The spin-wave modes in nanoscale permalloy stripes are studied using Brillouin light scattering for the case where an external magnetic field is applied transversely to the length of the stripes. By adjusting the magnitude of this external field, the overall magnetization may be varied between the approximately transverse and longitudinal orientations. The observed spin-wave frequencies are analysed using a recently developed microscopic dipole-exchange theory that is particularly appropriate when the magnetization displays strong spatial inhomogeneity. Comparison between theory and experiment for the two sizes of stripes studied gives fairly good agreement, allowing the magnetic parameters of permalloy to be deduced. A small magnetic anisotropy of the easy-plane type is shown to play an important role.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Italie</li></country></list><tree><country name="Canada"><noRegion><name sortKey="Nguyen, Hoa T" sort="Nguyen, Hoa T" uniqKey="Nguyen H" first="Hoa T." last="Nguyen">Hoa T. Nguyen</name></noRegion><name sortKey="Cottam, M G" sort="Cottam, M G" uniqKey="Cottam M" first="M. G." last="Cottam">M. G. Cottam</name></country><country name="Italie"><noRegion><name sortKey="Gubbiotti, G" sort="Gubbiotti, G" uniqKey="Gubbiotti G" first="G." last="Gubbiotti">G. Gubbiotti</name></noRegion><name sortKey="Madami, M" sort="Madami, M" uniqKey="Madami M" first="M." last="Madami">M. Madami</name><name sortKey="Tacchi, S" sort="Tacchi, S" uniqKey="Tacchi S" first="S." last="Tacchi">S. Tacchi</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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