Effect of the Dot Separation on the Switching Behavior of Ni-Fe Elliptical Dot Arrays

Endo, Yasushi; Fujimoto, Hiroki; Kawamura, Yoshio; Nakatani, Ryoichi; Yamamoto, Masahiko

doi:10.1109/tmag.2008.2001331

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…In contrast, recent work on onedimensional chains of nanoellipses, showed that the coercivity increased as the separations decreased. 8,9 This highlights the difference between one-and two-dimensional magnetostatic interactions. To understand the influence of the magnetostatic interactions on the magnetization reversal in two-dimensional arrays of nanoellipses, the effective anisotropy constant, K eff , the configurational anisotropy, K conf , and the normalized switching field distribution (SFD/H c ) have been analyzed quantitatively.…”

Section: Experimental Methodsmentioning

confidence: 94%

“…6,7 Far fewer studies have investigated arrays of ellipses or taken into account the shape anisotropy. [8][9][10][11][12] Webb and Atkinson 8 and Endo et al 9 have separately reported that increased magnetostatic interactions along the long axis of chains of Ni-Fe nanoellipses enhance the coercivity. Lyle et al 10 showed that in nanoscale elliptical magnetic tunnel junction structures, chains of structures parallel to the short axis of the ellipse develop a configurational anisotropy and overcome the inherent shape anisotropy to define a new easy axis direction.…”

Section: Introductionmentioning

confidence: 99%

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

Wang

Shi

Wei

et al. 2012

Journal of Applied Physics

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'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.

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Section: Experimental Methodsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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

Wang

Shi

Wei

et al. 2012

Journal of Applied Physics

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“…3. Figure 4 shows changes in the switching field due to the distance between adjacent dots D a [8]. The long axis a of the dots is changed from 200 nm to 1600 nm.…”

Section: Magnetostatic Interactions Between Magnetic Dotsmentioning

confidence: 99%

Magnetic logic devices composed of permalloy dots

Nakatani

Nomura

Endo

2009

J. Phys.: Conf. Ser.

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Effect of Size and Configuration on the Magnetization of Nickel Dot Arrays

2011

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We report experimental results on magnetic properties of our fabricated nickel nanodot arrays studied with magnetic force microscopy (MFM) and magneto-optical Kerr effect (MOKE). Arrays of nickel dots with different size and periodicity were fabricated by electronbeam (E-B) lithography and lift-off processes. 50 nm thick arrays (200 nm  200 nm) of nickel dots exhibit that the magnetization occurs independently in term of the direction of applied filed, while smaller arrays (120 nm  80 nm) with thicknesses ranging from 12 nm to 35 nm show the effect of size and configuration of arrays whose magnetic responses are different. Thinner dots in such array seem to assume single domain state with a preferential easy and hard axis in the array, but thicker dots shows a vortex type remanent magnetization. We ascribe the existence of the preferential magnetization axis to a dipolar-dipolar interaction due to small separation of single domain dots.

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Effect of the Dot Separation on the Switching Behavior of Ni-Fe Elliptical Dot Arrays

Cited by 4 publications

References 11 publications

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

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

Magnetic logic devices composed of permalloy dots

Effect of Size and Configuration on the Magnetization of Nickel Dot Arrays

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