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Simulation of transverse and longitudinal magnetic ripple structures induced by surface anisotropy

Simulation of transverse and longitudinal magnetic ripple structures induced by surface anisotropy

Lu, Hua, Bishop, J.E.L. and Tucker, J.W. (1996) Simulation of transverse and longitudinal magnetic ripple structures induced by surface anisotropy. Journal of Magnetism and Magnetic Materials, 163 (3). pp. 285-291. ISSN 0304-8853 (doi:10.1016/S0304-8853(96)00345-9)

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Abstract

Micromagnetic ripple structures on the surfaces of thick specimens of ultra-soft magnetic material having strong surface anisotropy Ks favouring out-of-surface magnetization have been calculated. These ripples have wavelengths of the order of 0.1 μm and extend to a depth ∼ √A/Ms, where A is the exchange constant and Ms is the saturation magnetization. The wave-vectors of the ripple structures are either transverse or parallel to the bulk magnetization. Both structures have lower energy than the one-dimensional structure discussed by O'Handley and Woods, and they exhibit stronger normal magnetization. The transverse structure requires a surface anisotropy Ks ≥ 0.80K0, where is that required for the one-dimensional structure. The threshold for longitudinal ripples is 0.84K0. It is suggested that the transverse structure probably constitutes the ground state. The magnitudes of Ks and A should be obtainable from measurements of the ripple wavelength and amplitude, and Ms.

Item Type: Article
Additional Information: [1] Available online: 13 May 1998. [2] Published in print: 1 November 1996.
Uncontrolled Keywords: surface anisotropy, computer simulation, micromagnetism, ripple structures
Subjects: Q Science > QA Mathematics > QA76 Computer software
Q Science > QC Physics
Pre-2014 Departments: School of Computing & Mathematical Sciences
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis
School of Computing & Mathematical Sciences > Centre for Numerical Modelling & Process Analysis > Computational Mechanics & Reliability Group
School of Computing & Mathematical Sciences > Department of Mathematical Sciences
Related URLs:
Last Modified: 14 Oct 2016 09:00
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/300

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