Manipulation of magnetization reversal of Ni81Fe19 nanoellipse arrays by tuning the shape anisotropy and the magnetostatic interactions

Abstract

'Manipulation of magnetization reversal of Ni81Fe19 nanoellipse arrays by tuning the shape anisotropy and the magnetostatic interactions.', Journal of applied physics., 111 (7). 07B909.Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Two series of highly ordered two-dimensional arrays of Ni 81 Fe 19 nanoellipses were nanofabaricated with different aspect ratios, R, and element separations, S, to investigate the influence of the self-demagnetization and the magnetostatic interaction upon the magnetization reversal. For nanostructures with low shape anisotropy, an additional magnetic easy axis was induced orthogonal to the shape-induced easy axis by reducing the separations along both axes. For the structures with larger shape anisotropy, the switching field distribution/coercivity (SFD/H c ) was reduced, and for the array with the smallest separations (20 nm and 35 nm along the long and short axes, respectively), coherent rotation of the whole array occurred. The magnitude of both the shape anisotropy and a configurational anisotropy induced by the magnetostatic interactions have been estimated. These results provide some useful information for the design of potential magnetic nanodot logic and for high-density magnetic random access memory.

Arrays of elliptical Fe(001) nanoparticles: Magnetization reversal, dipolar interactions, and effects of finite array sizes

“…The properties of the particles were reviewed by Guslienko [11], and their sensitivity to dipolar interactions was studied for different array configurations, e.g., by Novosad et al [12]. Also arrays with elliptical permalloy particles were studied, but to a lesser extent; see, e.g., the work by Wang et al [13], Pardavi-Horvath [14], and references therein.…”

Angular dependence of switching field distribution in (Co/Pd)n multilayer nanostructure arrays

“…It was found in earlier works that SFD is inversely correlated with the lateral dimensions of the nanostructures in an array 1,2 but increases as the areal density increases. 3 While significant progress has been made to uncover the intrinsic SFD (i.e., free of dipolar interaction) [3][4][5] and a systematic evaluation of SFD from the combined effects of array element size and pitch was performed for NiFe, 6 such treatment had been sparse for perpendicular materials.…”

Investigation of dipolar interaction in FINEMET ribbons through longitudinally driven magneto-impedance effect

“…In multi-entities magnetic system, the coupling is dominated by dipolar interaction when the distance between two magnetic entities is generally greater than the exchange interference length [1][2][3]. It plays a fundamental role in the formation of magnetic domains and effectively modulates their macroscopic magnetic properties, which always accompanies with a change of both the remnant magnetization and coercive/anisotropy field.…”