Exchange coupling driven omnidirectional rotatable anisotropy in ferrite doped CoFe thin film
Identifieur interne : 000236 ( Ncbi/Merge ); précédent : 000235; suivant : 000237Exchange coupling driven omnidirectional rotatable anisotropy in ferrite doped CoFe thin film
Auteurs : Guozhi Chai [Singapour] ; Nguyen N. Phuoc [Singapour] ; C. K. Ong [Singapour]Source :
- Scientific Reports [ 2045-2322 ] ; 2012.
Abstract
Isotropic magnetic materials with high resonant frequencies are useful for applications in microwave devices. Undoped CoFe thin films, as common soft magnetic materials with high saturation magnetization, show isotropic characteristics but no high frequency response. Here, we use ferrite doped CoFe thin film to realize a resonant frequency higher than 4.5 GHz at all orientations. The exchange coupling between ferrimagnet and ferromagnet is assumed to play a key role on the omnidirectional rotatable anisotropy.
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DOI: 10.1038/srep00832
PubMed: 23145323
PubMed Central: 3494020
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Exchange coupling driven omnidirectional rotatable anisotropy in ferrite doped CoFe thin film</title><author><name sortKey="Chai, Guozhi" sort="Chai, Guozhi" uniqKey="Chai G" first="Guozhi" last="Chai">Guozhi Chai</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Temasek Laboratories, National University of Singapore</institution>, Singapore 117411, Singapore</nlm:aff><country xml:lang="fr">Singapour</country><wicri:regionArea>, Singapore 117411</wicri:regionArea><wicri:noRegion>Singapore 117411</wicri:noRegion></affiliation></author><author><name sortKey="Phuoc, Nguyen N" sort="Phuoc, Nguyen N" uniqKey="Phuoc N" first="Nguyen N." last="Phuoc">Nguyen N. Phuoc</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Temasek Laboratories, National University of Singapore</institution>, Singapore 117411, Singapore</nlm:aff><country xml:lang="fr">Singapour</country><wicri:regionArea>, Singapore 117411</wicri:regionArea><wicri:noRegion>Singapore 117411</wicri:noRegion></affiliation></author><author><name sortKey="Ong, C K" sort="Ong, C K" uniqKey="Ong C" first="C. K." last="Ong">C. K. 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Phuoc</name><affiliation wicri:level="1"><nlm:aff id="a1"><institution>Temasek Laboratories, National University of Singapore</institution>, Singapore 117411, Singapore</nlm:aff><country xml:lang="fr">Singapour</country><wicri:regionArea>, Singapore 117411</wicri:regionArea><wicri:noRegion>Singapore 117411</wicri:noRegion></affiliation></author><author><name sortKey="Ong, C K" sort="Ong, C K" uniqKey="Ong C" first="C. K." last="Ong">C. K. Ong</name><affiliation wicri:level="1"><nlm:aff id="a2"><institution>Centre for Superconducting and Magnetic Materials, Department of Physics, National University of Singapore</institution>, Singapore 117542, Singapore</nlm:aff><country xml:lang="fr">Singapour</country><wicri:regionArea>, Singapore 117542</wicri:regionArea><wicri:noRegion>Singapore 117542</wicri:noRegion></affiliation></author></analytic><series><title level="j">Scientific Reports</title><idno type="eISSN">2045-2322</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Isotropic magnetic materials with high resonant frequencies are useful for applications in microwave devices. Undoped CoFe thin films, as common soft magnetic materials with high saturation magnetization, show isotropic characteristics but no high frequency response. Here, we use ferrite doped CoFe thin film to realize a resonant frequency higher than 4.5 GHz at all orientations. The exchange coupling between ferrimagnet and ferromagnet is assumed to play a key role on the omnidirectional rotatable anisotropy.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Wang, S X" uniqKey="Wang S">S. X. Wang</name></author><author><name sortKey="Sun, N X" uniqKey="Sun N">N. X. Sun</name></author><author><name sortKey="Yamaguchi, M" uniqKey="Yamaguchi M">M. Yamaguchi</name></author><author><name sortKey="Yabukami, S" uniqKey="Yabukami S">S. Yabukami</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Bozorth, R M" uniqKey="Bozorth R">R. M. Bozorth</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Jung, H S" uniqKey="Jung H">H. S. Jung</name></author><author><name sortKey="Doyle, W D" uniqKey="Doyle W">W. D. Doyle</name></author><author><name sortKey="Wittig, J E" uniqKey="Wittig J">J. E. Wittig</name></author><author><name sortKey="Al Sharab, J F" uniqKey="Al Sharab J">J. F. Al-Sharab</name></author><author><name sortKey="Bentley, J" uniqKey="Bentley J">J. Bentley</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Li, Y B" uniqKey="Li Y">Y. B. Li</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Fu, Y" uniqKey="Fu Y">Y. Fu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ohnuma, M" uniqKey="Ohnuma M">M. Ohnuma</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Xu, F" uniqKey="Xu F">F. Xu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Phuoc, N N" uniqKey="Phuoc N">N. N. Phuoc</name></author><author><name sortKey="Ong, C K" uniqKey="Ong C">C. K. Ong</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Kuanr, B K" uniqKey="Kuanr B">B. K. Kuanr</name></author><author><name sortKey="Camley, R E" uniqKey="Camley R">R. E. Camley</name></author><author><name sortKey="Celinski, Z" uniqKey="Celinski Z">Z. Celinski</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Stiles, M D" uniqKey="Stiles M">M. D. Stiles</name></author><author><name sortKey="Mcmichael, R D" uniqKey="Mcmichael R">R. D. McMichael</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Liu, Y" uniqKey="Liu Y">Y. Liu</name></author><author><name sortKey="Chen, L F" uniqKey="Chen L">L. F. Chen</name></author><author><name sortKey="Tan, C Y" uniqKey="Tan C">C. Y. Tan</name></author><author><name sortKey="Liu, H J" uniqKey="Liu H">H. J. Liu</name></author><author><name sortKey="Ong, C K" uniqKey="Ong C">C. K. 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Gilbert</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Lopusnik, R" uniqKey="Lopusnik R">R. Lopusnik</name></author><author><name sortKey="Nibarger, J P" uniqKey="Nibarger J">J. P. Nibarger</name></author><author><name sortKey="Silva, T J" uniqKey="Silva T">T. J. Silva</name></author><author><name sortKey="Celinski, Z" uniqKey="Celinski Z">Z. Celinski</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Schneider, M L" uniqKey="Schneider M">M. L. Schneider</name></author><author><name sortKey="Kos, A B" uniqKey="Kos A">A. B. Kos</name></author><author><name sortKey="Silva, T J" uniqKey="Silva T">T. J. Silva</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Radu, I" uniqKey="Radu I">I. Radu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Radu, F" uniqKey="Radu F">F. Radu</name></author><author><name sortKey="Abrudan, R" uniqKey="Abrudan R">R. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Sci Rep</journal-id><journal-id journal-id-type="iso-abbrev">Sci Rep</journal-id><journal-title-group><journal-title>Scientific Reports</journal-title></journal-title-group><issn pub-type="epub">2045-2322</issn><publisher><publisher-name>Nature Publishing Group</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">23145323</article-id><article-id pub-id-type="pmc">3494020</article-id><article-id pub-id-type="pii">srep00832</article-id><article-id pub-id-type="doi">10.1038/srep00832</article-id><article-categories><subj-group subj-group-type="heading"><subject>Article</subject></subj-group></article-categories><title-group><article-title>Exchange coupling driven omnidirectional rotatable anisotropy in ferrite doped CoFe thin film</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Chai</surname><given-names>Guozhi</given-names></name><xref ref-type="aff" rid="a1">1</xref></contrib><contrib contrib-type="author"><name><surname>Phuoc</surname><given-names>Nguyen N.</given-names></name><xref ref-type="aff" rid="a1">1</xref></contrib><contrib contrib-type="author"><name><surname>Ong</surname><given-names>C. K.</given-names></name><xref ref-type="corresp" rid="c1">a</xref><xref ref-type="aff" rid="a2">2</xref></contrib><aff id="a1"><label>1</label><institution>Temasek Laboratories, National University of Singapore</institution>, Singapore 117411, Singapore</aff><aff id="a2"><label>2</label><institution>Centre for Superconducting and Magnetic Materials, Department of Physics, National University of Singapore</institution>, Singapore 117542, Singapore</aff></contrib-group><author-notes><corresp id="c1"><label>a</label><email>phyongck@nus.edu.sg</email></corresp></author-notes><pub-date pub-type="epub"><day>09</day><month>11</month><year>2012</year></pub-date><pub-date pub-type="collection"><year>2012</year></pub-date><volume>2</volume><elocation-id>832</elocation-id><history><date date-type="received"><day>02</day><month>07</month><year>2012</year></date><date date-type="accepted"><day>27</day><month>09</month><year>2012</year></date></history><permissions><copyright-statement>Copyright © 2012, Macmillan Publishers Limited. All rights reserved</copyright-statement><copyright-year>2012</copyright-year><copyright-holder>Macmillan Publishers Limited. All rights reserved</copyright-holder><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc-nd/3.0/"><pmc-comment>author-paid</pmc-comment>
<license-p>This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivs Works 3.0 Unported License. To view a copy of this license, visit <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc-nd/3.0/">http://creativecommons.org/licenses/by-nc-nd/3.0/</ext-link></license-p></license></permissions><abstract><p>Isotropic magnetic materials with high resonant frequencies are useful for applications in microwave devices. Undoped CoFe thin films, as common soft magnetic materials with high saturation magnetization, show isotropic characteristics but no high frequency response. Here, we use ferrite doped CoFe thin film to realize a resonant frequency higher than 4.5 GHz at all orientations. The exchange coupling between ferrimagnet and ferromagnet is assumed to play a key role on the omnidirectional rotatable anisotropy.</p></abstract></article-meta></front><floats-group><fig id="f1"><label>Figure 1</label><caption><p>(a) Co and (b) Ni mapping results of NiZn ferrite doped CoFe thin films.Blue and yellow dots show the distribution of Co and Ni element, respectively. The backgrounds are the corresponding SEM picture. (c) Microstructure sketch map of ferrite doped CoFe thin films to explain the “exchanged” interaction between the CoFe-NiZnFeO matrix and CoFe grains. The insert is a sketch map of magnetization distribution of the CoFe-NiZnFeO matrix.</p></caption><graphic xlink:href="srep00832-f1"></graphic></fig><fig id="f2"><label>Figure 2</label><caption><title>Resistivity <italic>ρ</italic> and saturation magnetization 4<italic>πM<sub>s</sub></italic> behave as a function of the concentration of doped elements.</title><p>The error bar comes from the contact resistance during measurement and the thickness measurement of the thin films.</p></caption><graphic xlink:href="srep00832-f2"></graphic></fig><fig id="f3"><label>Figure 3</label><caption><p>(a), (b) M-H loops of undoped (a) and ferrite doped (b) CoFe thin films, black and red loops are picked from different direction with largest differences.Inserts are the magnetic permeability spectra of corresponding sample. (c) The changes of coercivities and in plane uniaxial anisotropic fields with the concentration of doped elements. (d) The changes of the resonant frequency of magnetic permeability spectra with the concentration of doped elements.</p></caption><graphic xlink:href="srep00832-f3"></graphic></fig><fig id="f4"><label>Figure 4</label><caption><title>The high frequency properties of ferrite doped CoFe thin films.</title><p>(a) The geometry of the measurement, <italic>θ</italic> is the angle of the magnetic easy axis to the applied magnetic field. (b) The angular dependence of the resonant frequency for ferrite doped CoFe thin film without additional magnetic fields, the dark circle correspond to <italic>f<sub>r</sub></italic> = 4.55 GHz. (c) The dependence of resonant frequency squared (<italic>f<sub>r</sub></italic><sup>2</sup>) as a function of additional magnetic field <italic>H</italic><sub>app</sub> are shown for <italic>θ</italic> = 0°, 40°, 90°. (d) The dependence of <italic>H<sub>k</sub></italic><sup>dyn</sup> on <italic>θ</italic> for ferrite doped CoFe thin films. The line are the fitted curves to the equation <italic>H<sub>k</sub></italic><sup>dyn</sup> = <italic>H<sub>k</sub></italic>cos 2<italic>θ</italic> +<italic>H<sub>k</sub></italic><sup>rot</sup>. The horizontal line is <italic>H<sub>k</sub></italic><sup>rot</sup> = <italic>H<sub>k</sub></italic><sup>dyn</sup> – <italic>H<sub>k</sub></italic><sup>stat</sup> = 292 Oe.</p></caption><graphic xlink:href="srep00832-f4"></graphic></fig></floats-group></pmc><affiliations><list><country><li>Singapour</li></country></list><tree><country name="Singapour"><noRegion><name sortKey="Chai, Guozhi" sort="Chai, Guozhi" uniqKey="Chai G" first="Guozhi" last="Chai">Guozhi Chai</name></noRegion><name sortKey="Ong, C K" sort="Ong, C K" uniqKey="Ong C" first="C. K." last="Ong">C. K. Ong</name><name sortKey="Phuoc, Nguyen N" sort="Phuoc, Nguyen N" uniqKey="Phuoc N" first="Nguyen N." last="Phuoc">Nguyen N. Phuoc</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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