Magnetic properties and rotational hysteresis of Fe3O4 and γ-Fe2O3 particles ∼ 250 nm in diameter
Identifieur interne : 002651 ( Main/Exploration ); précédent : 002650; suivant : 002652Magnetic properties and rotational hysteresis of Fe3O4 and γ-Fe2O3 particles ∼ 250 nm in diameter
Auteurs : E. Schmidbauer [Allemagne] ; R. Keller [Allemagne]Source :
- Journal of Magnetism and Magnetic Materials [ 0304-8853 ] ; 1995.
Abstract
We report the magnetic properties for dispersed, spherical Fe3O4 and γ-Fe2O3 particles ∼ 250 nm in diameter in the temperature range T = 4.2–294 K. For Fe3O4, hysteresis properties show anomalies at 130 K, where the magnetocrystalline anisotropy constant K1 vanishes; the ratio Hc/Is (Hc = coercive force, Is = saturation magnetization) follows a linear relationship with K1/Is2 between 130 and 294 K. Below the Verwey transition temperature TV (∼ 120 K, the hysteresis properties depend on whether the sample is cooled in a strong magnetic field or in zero field; no magnetic anomalies were observed for γ-Fe2O3 particles, generated by oxidizing the Fe3O4 particles under study. The rotational hysteresis integral at 294 K is ∼ 0.7 for both compounds, pointing to a coherent-type magnetization reversal for assumed uniaxial single-domain particles (SDPs); however, the reduced saturation remanence is only ∼ 0.2, far below that for SDPs. Possible models for the particle magnetization modes are discussed.
Url:
DOI: 10.1016/0304-8853(95)00446-7
Affiliations:
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Schmidbauer</name><affiliation wicri:level="4"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Allgemeine und Angewandte Geophysik der Universität München, Theresienstr. 41, D-80333 München</wicri:regionArea><placeName><region type="land" nuts="1">Bavière</region><region type="district" nuts="2">District de Haute-Bavière</region><settlement type="city">Munich</settlement></placeName><orgName type="university">Université Louis-et-Maximilien de Munich</orgName></affiliation></author><author><name sortKey="Keller, R" sort="Keller, R" uniqKey="Keller R" first="R." last="Keller">R. Keller</name><affiliation wicri:level="4"><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Allgemeine und Angewandte Geophysik der Universität München, Theresienstr. 41, D-80333 München</wicri:regionArea><placeName><region type="land" nuts="1">Bavière</region><region type="district" nuts="2">District de Haute-Bavière</region><settlement type="city">Munich</settlement></placeName><orgName type="university">Université Louis-et-Maximilien de Munich</orgName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Magnetism and Magnetic Materials</title><title level="j" type="abbrev">MAGMA</title><idno type="ISSN">0304-8853</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1995">1995</date><biblScope unit="volume">152</biblScope><biblScope unit="issue">1–2</biblScope><biblScope unit="page" from="99">99</biblScope><biblScope unit="page" to="108">108</biblScope></imprint><idno type="ISSN">0304-8853</idno></series><idno type="istex">0F78B001905CEEC6609F0887E8818AA6BDE503B0</idno><idno type="DOI">10.1016/0304-8853(95)00446-7</idno><idno type="PII">0304-8853(95)00446-7</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0304-8853</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We report the magnetic properties for dispersed, spherical Fe3O4 and γ-Fe2O3 particles ∼ 250 nm in diameter in the temperature range T = 4.2–294 K. For Fe3O4, hysteresis properties show anomalies at 130 K, where the magnetocrystalline anisotropy constant K1 vanishes; the ratio Hc/Is (Hc = coercive force, Is = saturation magnetization) follows a linear relationship with K1/Is2 between 130 and 294 K. Below the Verwey transition temperature TV (∼ 120 K, the hysteresis properties depend on whether the sample is cooled in a strong magnetic field or in zero field; no magnetic anomalies were observed for γ-Fe2O3 particles, generated by oxidizing the Fe3O4 particles under study. The rotational hysteresis integral at 294 K is ∼ 0.7 for both compounds, pointing to a coherent-type magnetization reversal for assumed uniaxial single-domain particles (SDPs); however, the reduced saturation remanence is only ∼ 0.2, far below that for SDPs. Possible models for the particle magnetization modes are discussed.</div></front></TEI><affiliations><list><country><li>Allemagne</li></country><region><li>Bavière</li><li>District de Haute-Bavière</li></region><settlement><li>Munich</li></settlement><orgName><li>Université Louis-et-Maximilien de Munich</li></orgName></list><tree><country name="Allemagne"><region name="Bavière"><name sortKey="Schmidbauer, E" sort="Schmidbauer, E" uniqKey="Schmidbauer E" first="E." last="Schmidbauer">E. Schmidbauer</name></region><name sortKey="Keller, R" sort="Keller, R" uniqKey="Keller R" first="R." last="Keller">R. Keller</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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