Quantitative analysis of interaction between domain walls and magnetic nanoparticles

Todd Klein; Daniel Dorroh; Yuanpeng Li; Jian Ping Wang

doi:10.1063/1.3549558

Quantitative analysis of interaction between domain walls and magnetic nanoparticles

Todd Klein, Daniel Dorroh, Yuanpeng Li, Jian Ping Wang

Electrical and Computer Engineering

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4 Scopus citations

Abstract

We have studied the potential energy and effective field induced by the presence of a single superparamagnetic particle above a magnetic domain wall in a 5 nm ferromagnetic film (Ms 800 emu/cm³) with uniaxial crystalline anisotropy (K_u>10⁷ erg/cm³). The wall width, wall type (head-to-head, Néel, and perpendicular Bloch), film dimensions, particle height, and external applied field are found to affect the performance of particle sensing systems. Results and optimization strategies derived from this model are presented. The calculated change in depinning field (H_dp) is compared against experimental data and micromagnetic simulation. This comparison provides justification for further development in terms of integration with micromagnetic simulations.

Original language	English (US)
Article number	07D506
Journal	Journal of Applied Physics
Volume	109
Issue number	7
DOIs	https://doi.org/10.1063/1.3549558
State	Published - Apr 1 2011

Bibliographical note

Funding Information:
Support provided by the National Science Foundation under award number BME 0730825, Institute of Engineering in Medicine and University of Minnesota Supercomputing Institute.

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10.1063/1.3549558

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abstract = "We have studied the potential energy and effective field induced by the presence of a single superparamagnetic particle above a magnetic domain wall in a 5 nm ferromagnetic film (Ms 800 emu/cm3) with uniaxial crystalline anisotropy (Ku>107 erg/cm3). The wall width, wall type (head-to-head, N{\'e}el, and perpendicular Bloch), film dimensions, particle height, and external applied field are found to affect the performance of particle sensing systems. Results and optimization strategies derived from this model are presented. The calculated change in depinning field (Hdp) is compared against experimental data and micromagnetic simulation. This comparison provides justification for further development in terms of integration with micromagnetic simulations.",

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AU - Dorroh, Daniel

AU - Li, Yuanpeng

AU - Wang, Jian Ping

N1 - Funding Information: Support provided by the National Science Foundation under award number BME 0730825, Institute of Engineering in Medicine and University of Minnesota Supercomputing Institute.

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N2 - We have studied the potential energy and effective field induced by the presence of a single superparamagnetic particle above a magnetic domain wall in a 5 nm ferromagnetic film (Ms 800 emu/cm3) with uniaxial crystalline anisotropy (Ku>107 erg/cm3). The wall width, wall type (head-to-head, Néel, and perpendicular Bloch), film dimensions, particle height, and external applied field are found to affect the performance of particle sensing systems. Results and optimization strategies derived from this model are presented. The calculated change in depinning field (Hdp) is compared against experimental data and micromagnetic simulation. This comparison provides justification for further development in terms of integration with micromagnetic simulations.

AB - We have studied the potential energy and effective field induced by the presence of a single superparamagnetic particle above a magnetic domain wall in a 5 nm ferromagnetic film (Ms 800 emu/cm3) with uniaxial crystalline anisotropy (Ku>107 erg/cm3). The wall width, wall type (head-to-head, Néel, and perpendicular Bloch), film dimensions, particle height, and external applied field are found to affect the performance of particle sensing systems. Results and optimization strategies derived from this model are presented. The calculated change in depinning field (Hdp) is compared against experimental data and micromagnetic simulation. This comparison provides justification for further development in terms of integration with micromagnetic simulations.

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Quantitative analysis of interaction between domain walls and magnetic nanoparticles

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