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.
|Original language||English (US)|
|Journal||Journal of Applied Physics|
|State||Published - Apr 1 2011|
Bibliographical noteFunding Information:
Support provided by the National Science Foundation under award number BME 0730825, Institute of Engineering in Medicine and University of Minnesota Supercomputing Institute.