Magnetic Nanoparticles with Core Shell: Macroscopic Model and Coercive Field
There exists nonhomogeneous structure in mechanosynthesized nanoparticles consisting of an ordered core surrounded by the shell. The shell may be structurally and magnetically disordered, or it may be ordered. These nanoparticles are found to be roughly spherical. We formulate the macroscopic model...
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| Format: | Article |
| Language: | English |
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Wiley
2010-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2010/909810 |
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| author | O. Hudak M. Hudak |
| author_facet | O. Hudak M. Hudak |
| author_sort | O. Hudak |
| collection | DOAJ |
| description | There exists nonhomogeneous structure in mechanosynthesized nanoparticles consisting of an ordered core surrounded by the shell. The shell may be structurally and magnetically disordered, or it may be ordered. These nanoparticles are found to be roughly spherical. We formulate the macroscopic model for the description of magnetic properties of nanoparticles with core-shell structure. The case of spheroids oriented in the same direction of polar axes is considered. There exits two coercive fields: Hcγ and Hcψ. They are depending on quantities o
and x, where x=V2/(V1−2V2), and o=IF/IS , here V1 is the volume of the nanoparticle, and V2 is the volume of the core. IF is the magnetization of the core, and IS is the
magnetization of the shell. There exists a transition from one type of the coercive field to another, changing x and o. We have found qualitative explanation
of observed enhancement of coercive field and of its d-dependence in NiFe2O4 nanoparticles. |
| format | Article |
| id | doaj-art-d70ea39ebb264b7f823077594a31e163 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2010-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-d70ea39ebb264b7f823077594a31e1632025-02-03T01:28:00ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422010-01-01201010.1155/2010/909810909810Magnetic Nanoparticles with Core Shell: Macroscopic Model and Coercive FieldO. Hudak0M. Hudak1Applied Physics Group, Department of Aerodynamics and Simulations, Faculty of Avionics, Technical University of Kosice, Rampova 7, Stierova 23, SK-040 23 Kosice, SlovakiaStierova 23, SK-040 23 Kosice, SlovakiaThere exists nonhomogeneous structure in mechanosynthesized nanoparticles consisting of an ordered core surrounded by the shell. The shell may be structurally and magnetically disordered, or it may be ordered. These nanoparticles are found to be roughly spherical. We formulate the macroscopic model for the description of magnetic properties of nanoparticles with core-shell structure. The case of spheroids oriented in the same direction of polar axes is considered. There exits two coercive fields: Hcγ and Hcψ. They are depending on quantities o and x, where x=V2/(V1−2V2), and o=IF/IS , here V1 is the volume of the nanoparticle, and V2 is the volume of the core. IF is the magnetization of the core, and IS is the magnetization of the shell. There exists a transition from one type of the coercive field to another, changing x and o. We have found qualitative explanation of observed enhancement of coercive field and of its d-dependence in NiFe2O4 nanoparticles.http://dx.doi.org/10.1155/2010/909810 |
| spellingShingle | O. Hudak M. Hudak Magnetic Nanoparticles with Core Shell: Macroscopic Model and Coercive Field Advances in Materials Science and Engineering |
| title | Magnetic Nanoparticles with Core Shell: Macroscopic Model and Coercive Field |
| title_full | Magnetic Nanoparticles with Core Shell: Macroscopic Model and Coercive Field |
| title_fullStr | Magnetic Nanoparticles with Core Shell: Macroscopic Model and Coercive Field |
| title_full_unstemmed | Magnetic Nanoparticles with Core Shell: Macroscopic Model and Coercive Field |
| title_short | Magnetic Nanoparticles with Core Shell: Macroscopic Model and Coercive Field |
| title_sort | magnetic nanoparticles with core shell macroscopic model and coercive field |
| url | http://dx.doi.org/10.1155/2010/909810 |
| work_keys_str_mv | AT ohudak magneticnanoparticleswithcoreshellmacroscopicmodelandcoercivefield AT mhudak magneticnanoparticleswithcoreshellmacroscopicmodelandcoercivefield |