Numerical study of hysteresis and morphology in elongated tape particles

Seberino, C.; Bertram, H.N.

doi:10.1063/1.369889

Cited by 17 publications

(9 citation statements)

References 7 publications

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“…11,[25][26][27] The pillars are discretized into cu-bic cells whose size is always smaller than the exchange length, which is defined as l ex ϭͱ(A)/M s , where A is the exchange constant and M s the saturation moment. This is 21 nm for pure Ni taking Aϭ10 Ϫ6 erg cm Ϫ1 .…”

Section: Micromagnetic Modelingmentioning

confidence: 99%

“…Smaller cell sizes give similar results. 11,25 The equilibrium magnetization distribution is calculated for different applied fields. The simulation starts with the magnetizations of all the cells aligned in the direction of a field which is large enough to saturate the particle.…”

Section: Micromagnetic Modelingmentioning

confidence: 99%

“…The switching of high-symmetry bodies such as ellipsoids, infinite cylinders, and spheres can be treated analytically, and many authors have analyzed the behavior of these particles in terms of the coherent rotation model of Stoner and Wohlfarth 1 and the curling model of Frei et al 2 Particles with lower symmetry have been treated using numerical micromagnetics. [3][4][5][6][7][8][9] Recent advances in both nanofabrication and computing power allow us to now correlate experimental results on lithographically patterned magnetic particles with analytical or numerical micromagnetic predictions, [8][9][10][11][12][13][14][15][16] thus opening the possibility of applying computations to the design and optimization of nanomagnet arrays for data storage and other applications. Of particular interest is modeling the temperature-dependent properties of magnetic nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

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Effect of temperature and cubic anisotropy on the switching field of cylindrical Ni particles

Hwang

Shima

Ross

et al. 2002

Journal of Applied Physics

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The switching fields of nickel cylinders with ϳ100 nm dimensions have been compared to the predictions of a numerical micromagnetic model. The switching field decreases with increasing diameter and decreasing aspect ratio, and there is a good agreement between the measured and calculated values. The samples have a strong ͗111͘ preferred crystal orientation, and the large increase in switching field and switching field distribution with decreasing temperature can be explained by the large increase in magnetocrystalline anisotropy at low temperatures.

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Section: Micromagnetic Modelingmentioning

confidence: 99%

Section: Micromagnetic Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of temperature and cubic anisotropy on the switching field of cylindrical Ni particles

Hwang

Shima

Ross

et al. 2002

Journal of Applied Physics

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“…In other words the coercivity curve is symmetric about 45 . Seberino and Bertram [5] also reported a similar trend of the magnetic reversal curve using micromagnetic modeling. Their model shows that the switching field slightly decreases with increasing angle up to 45 and slightly increase again up to near 80 .…”

Section: Resultsmentioning

confidence: 52%

Interisland spacing and angle effects on magnetic reversal in permalloy arrays

2002

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Abstract-The switching characteristics of submicron permalloy elements were systematically studied as a function of interisland spacing. The result was an increase of the switching field with reduction in spacing, with a maximum value for near zero spacing. However, in overlapped segments, all elements switched simultaneously at lower fields than the maximum at zero spacing. The switching field depends on the number of connected segments as described by the Jacobs-Bean model, whereas the switching of the separated islands is governed mainly by the field emanating from the nearest-neighbor magnetic poles. The reversal behavior of the branched contiguous array was also studied. The angle between the branch axis and the easy axis played a critical role in establishing the switching field. The reversal field of the branched segment reached a minimum at 45 and a maximum at 90 . A coherent rotation model, which includes the effect of the array geometry, appears to explain the trends.

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“…The rigorous micromagnetic simulations have been performed for single, isolated nanowires and elongated particles (Seberino & Bertram, 1999;Ferre et al, 1997;Hinzke & Nowak, 2000). In these cases, the magnetostatic interaction of neighbouring wires was generally omitted from the simulations.…”

Section: Non-coherent Rotation Modelmentioning

confidence: 99%