ac susceptibility of an assembly of nanomagnets: Combined effects of surface anisotropy and dipolar interactions
We compute the ac susceptibility of a weakly dipolar-interacting monodisperse assembly of magnetic nanoclusters with oriented anisotropy. For this purpose, we first compute the relaxation rate in a longitudinal magnetic field of a single nanomagnet taking account of both dipolar interactions in the...
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| Veröffentlicht in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-09, Vol.90 (9), Article 094416 |
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| container_title | Physical review. B, Condensed matter and materials physics |
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| creator | Vernay, F. Sabsabi, Z. Kachkachi, H. |
| description | We compute the ac susceptibility of a weakly dipolar-interacting monodisperse assembly of magnetic nanoclusters with oriented anisotropy. For this purpose, we first compute the relaxation rate in a longitudinal magnetic field of a single nanomagnet taking account of both dipolar interactions in the case of dilute assemblies and surface anisotropy. We then study the behavior of the real and imaginary components of the ac susceptibility as functions of temperature, frequency, surface anisotropy, and interparticle interactions. We find that the surface anisotropy induces an upward shift of the temperature at the maximum of the ac susceptibility components and that its effects may be tuned so as to screen out the effects of interactions. The phenomenological Vogel-Fulcher law for the effect of dipolar interaction on the relaxation rate is revisited within our formalism and a semianalytical expression is given for the effective temperature in terms of inter alia the applied field, surface anisotropy, and dipolar interaction. |
| doi_str_mv | 10.1103/PhysRevB.90.094416 |
| format | Article |
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For this purpose, we first compute the relaxation rate in a longitudinal magnetic field of a single nanomagnet taking account of both dipolar interactions in the case of dilute assemblies and surface anisotropy. We then study the behavior of the real and imaginary components of the ac susceptibility as functions of temperature, frequency, surface anisotropy, and interparticle interactions. We find that the surface anisotropy induces an upward shift of the temperature at the maximum of the ac susceptibility components and that its effects may be tuned so as to screen out the effects of interactions. The phenomenological Vogel-Fulcher law for the effect of dipolar interaction on the relaxation rate is revisited within our formalism and a semianalytical expression is given for the effective temperature in terms of inter alia the applied field, surface anisotropy, and dipolar interaction.</description><identifier>ISSN: 1098-0121</identifier><identifier>EISSN: 1550-235X</identifier><identifier>DOI: 10.1103/PhysRevB.90.094416</identifier><language>eng</language><publisher>American Physical Society</publisher><subject>Anisotropy ; Assembly ; Condensed matter ; Formalism ; Magnetic fields ; Magnetic permeability ; Mathematical analysis ; Nanostructure ; Physics</subject><ispartof>Physical review. 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The phenomenological Vogel-Fulcher law for the effect of dipolar interaction on the relaxation rate is revisited within our formalism and a semianalytical expression is given for the effective temperature in terms of inter alia the applied field, surface anisotropy, and dipolar interaction.</description><subject>Anisotropy</subject><subject>Assembly</subject><subject>Condensed matter</subject><subject>Formalism</subject><subject>Magnetic fields</subject><subject>Magnetic permeability</subject><subject>Mathematical analysis</subject><subject>Nanostructure</subject><subject>Physics</subject><issn>1098-0121</issn><issn>1550-235X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><recordid>eNo9kUtPwzAQhCMEEqXwBzjlCIcUO3Ee5gYVUKRKIAQSN2vjBzVK4uB1KuXfk1LgtLOrb-cwE0XnlCwoJdnV82bEF729XXCyIJwxWhxEM5rnJEmz_P1w0oRXCaEpPY5OED8JoYyzdBb1IGMcUOo-2No2NoyxMzF0MSDqtm5-1g4618JHpwNex0vX1rbTKtbGaBlwB-DgDUg9_Vl0wbt-nKSKle1dAz62XdAeZLCuw9PoyECD-ux3zqO3-7vX5SpZPz08Lm_WiWQpC4mSppSKGl3nJJOKVUQrCoSVkuVQAFUMmCkLXdG0NhVRSpWM5xU3tIaClzKbR5d73w00ove2BT8KB1asbtZid5vCSLM041s6sRd7tvfua9AYRGunSJoGOu0GFLQkvGRTZNWEpntUeofotfn3pkTsqhB_VQhOxL6K7BtBl4Cd</recordid><startdate>20140923</startdate><enddate>20140923</enddate><creator>Vernay, F.</creator><creator>Sabsabi, Z.</creator><creator>Kachkachi, H.</creator><general>American Physical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0002-6954-8117</orcidid><orcidid>https://orcid.org/0000-0003-3713-7724</orcidid></search><sort><creationdate>20140923</creationdate><title>ac susceptibility of an assembly of nanomagnets: Combined effects of surface anisotropy and dipolar interactions</title><author>Vernay, F. ; Sabsabi, Z. ; Kachkachi, H.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c424t-dcf7cd1feb503cd480ed1a047c45a6a1d4a4f76e812bf80ddd749589f1ba697c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Anisotropy</topic><topic>Assembly</topic><topic>Condensed matter</topic><topic>Formalism</topic><topic>Magnetic fields</topic><topic>Magnetic permeability</topic><topic>Mathematical analysis</topic><topic>Nanostructure</topic><topic>Physics</topic><toplevel>online_resources</toplevel><creatorcontrib>Vernay, F.</creatorcontrib><creatorcontrib>Sabsabi, Z.</creatorcontrib><creatorcontrib>Kachkachi, H.</creatorcontrib><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Physical review. 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| ispartof | Physical review. B, Condensed matter and materials physics, 2014-09, Vol.90 (9), Article 094416 |
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| language | eng |
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| source | American Physical Society Journals |
| subjects | Anisotropy Assembly Condensed matter Formalism Magnetic fields Magnetic permeability Mathematical analysis Nanostructure Physics |
| title | ac susceptibility of an assembly of nanomagnets: Combined effects of surface anisotropy and dipolar interactions |
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