The magnetization in an infinite two-dimensional hexagonal array of small magnetic single-domain nanoparticles is studied by theoretical calculations. Various hysteresis loops and analytical expressions of coercivity and saturation field of the system with different particle sizes and array densities are obtained under the assumption of magnetization reversal mechanisms based on the competition between the dipolar interaction energy and the shape anisotropy energy with an external magnetic field perpendicular to the array plane. The hysteresis loop varies from a rectangle to a nonhysteresis straight line through a set of complicated loops composed of two types, which is in accordance with the magnetization reversal process varying from an independent coherent rotation to an “antisymmetric-ferromagnetic chain” mechanism. Our results can give a reasonable reference to the application of perpendicular magnetic recording media.
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15 November 2006
Research Article|
November 22 2006
Hysteresis of hexagonal arrays of magnetic nanodots
Desheng Xue;
Desheng Xue
Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,
Lanzhou University
, Gansu 730000, People’s Republic of China
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Zhongjie Yan
Zhongjie Yan
a)
Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,
Lanzhou University
, Gansu 730000, People’s Republic of China
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a)
Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Appl. Phys. 100, 103906 (2006)
Article history
Received:
June 12 2006
Accepted:
September 25 2006
Citation
Desheng Xue, Zhongjie Yan; Hysteresis of hexagonal arrays of magnetic nanodots. J. Appl. Phys. 15 November 2006; 100 (10): 103906. https://doi.org/10.1063/1.2387123
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