Thermodynamic Properties of Small Magnetic Particles
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| Format: | Artículo científico |
| Language: | en |
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Sociedade Brasileira de Física
2006
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| _version_ | 1876425589489926144 |
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| author | Vanessa Souza Leite |
| author_facet | Vanessa Souza Leite |
| contents | Thermodynamic Properties of Small Magnetic Particles Vanessa Souza Leite Wagner Figueiredo Física, Astronomía y Matemáticas Magnetismo Finite systems Monte Carlo simulations We investigate the equilibrium magnetic properties of a simple cubic small ferromagnetic particle under an external magnetic field. Although the particle is small, it can not be considered as a single-domain unit. The magnetic moments are represented by unitary spin vectors and we consider ferromagnetic interactions between nearest-neighbor spins. The coupling between spins is given in terms of the classical Heisenberg Hamiltonian and we also include a Zeeman contribution and a single-ion uniaxial anisotropy. The size of the particle changes from one to twelve lattice spacings. We employ in our study mean-filed calculations and Monte Carlo simulations. The magnetization and susceptibility curves as a function of temperature show that an uniaxial anisotropy can mimic a ferromagnetic or an antiferromagnetic coupling, depending on the angle between the external magnetic field and the easy axis. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413654013 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3A Vol.36 |
| format | Artículo científico |
| id | redalyc_46413654013 |
| institution | Redalyc |
| language | en |
| publishDate | 2006 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Thermodynamic Properties of Small Magnetic Particles Vanessa Souza Leite Física, Astronomía y Matemáticas Magnetismo Finite systems Monte Carlo simulations Thermodynamic Properties of Small Magnetic Particles Vanessa Souza Leite Wagner Figueiredo Física, Astronomía y Matemáticas Magnetismo Finite systems Monte Carlo simulations We investigate the equilibrium magnetic properties of a simple cubic small ferromagnetic particle under an external magnetic field. Although the particle is small, it can not be considered as a single-domain unit. The magnetic moments are represented by unitary spin vectors and we consider ferromagnetic interactions between nearest-neighbor spins. The coupling between spins is given in terms of the classical Heisenberg Hamiltonian and we also include a Zeeman contribution and a single-ion uniaxial anisotropy. The size of the particle changes from one to twelve lattice spacings. We employ in our study mean-filed calculations and Monte Carlo simulations. The magnetization and susceptibility curves as a function of temperature show that an uniaxial anisotropy can mimic a ferromagnetic or an antiferromagnetic coupling, depending on the angle between the external magnetic field and the easy axis. 2006 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413654013 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3A Vol.36 |
| title | Thermodynamic Properties of Small Magnetic Particles |
| topic | Física, Astronomía y Matemáticas Magnetismo Finite systems Monte Carlo simulations |
| url | https://www.redalyc.org/articulo.oa?id=46413654013 |