Effect of surface roughness on magnetic domain wall thickness, domain size, and coercivity

Zhao, Yiping; Gamache, R. M.; Wang, G.-C.; Lu, T.‐M.; Palasantzas, G.; Hosson, J.Th.M. De

doi:10.1063/1.1331065

Cited by 164 publications

(67 citation statements)

References 29 publications

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“…4 using a peak-to-peak roughness ͑␦͒ amplitude of 200 nm and a correlation length of 400 nm ͑␥͒. Therefore, qualitative agreement is obtained by using Zhao et al's model of coercivity 24 and our measurements of the thin films.…”

Section: H Csupporting

confidence: 69%

“…In this model the effective anisotropy is an average of the crystalline anisotropy within the exchange length ͑typically ϳ50 nm͒ and the coercivity is very sensitive to the grain size H c anis ϰ D 6 . Recently, Zhao et al 24 proposed a model to describe coercivity, which yields H c ϰ 1 / t. This model includes the effect of roughness on the demagnetizing field and on domain-wall movement, which in turn is reflected on coercivity:…”

Section: H Cmentioning

confidence: 99%

“…Here rms is a dimensionless measure of roughness, 24 A is the exchange constant, D w is the domain-wall width, t is the film thickness, K 1 is the anisotropy constant, and J s is the saturation magnetization. In this model the additional contribution to the coercivity becomes zero in a perfectly flat smooth film.…”

Section: H Cmentioning

confidence: 99%

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Dependence of magnetic properties on micro- to nanostructure of CoNiFe films

Rhen

Roy

2008

Journal of Applied Physics

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The magnetic properties of electrodeposited CoNiFe films with thicknesses varying from 0.20 to 10 μm were studied. The films show a single face-centered-cubic CoNiFe phase with grain sizes ranging from 23 to 29 nm. The coercivity is controlled by a combination of the morphology and nanocrystalline structure of the deposits. The nanocrystalline grain size determines the intrinsic coercivity associated with crystalline anisotropy as in the random anisotropy model, whereas an additional morphology term of coercivity is controlled by the thickness inhomogeneity on a submicron scale. The thin films show considerable roughness and a higher coercivity, up to a level of 560 A m−1 (7.0 Oe) in 250 nm films. The thick films show coercivity values of as low as 16 A m−1 (0.2 Oe). The coercivity dependence on thickness was fitted using a simple model combining a morphology dependent additional contribution term to the random anisotropy model as Hc=Hcmorph+Hcanis. Good agreement between the model and the experimental results was obtained.

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Section: H Csupporting

confidence: 69%

Section: H Cmentioning

confidence: 99%

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Dependence of magnetic properties on micro- to nanostructure of CoNiFe films

Rhen

Roy

2008

Journal of Applied Physics

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“…This pinning effect induced by nanoholes is hindering the domain wall propagation through the film plane, which makes to increase the coercivity of the antidots samples respect to the continuous thin films. Additionally, the magnetostatic dipolar interaction among the holes gives rise to a demagnetizing field in the opposite direction to magnetization [27]. Furthermore, for the antidot samples we found an opposite thickness dependent behavior of H c , as illustrated in Fig.…”

Section: Magnetic Properties Of Fe Thin Filmssupporting

confidence: 48%

Template Assisted Deposition of Ferromagnetic Nanostructures: from Antidot Thin Films to Multisegmented Nanowires

et al. 2017

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The growth of nanostructured materials by means of different deposition methods employing nanoporous anodic aluminum oxide membranes as patterned templates has been widely used during last years due to the outstanding features displayed by these nanoporous templates. Here we report on the synthesis, morphology and magnetic properties exhibited by novel magnetic 1D and 2D nanostructured materials having nanowire or antidot thin films geometry, respectively, together to that of geometrically diameter modulated ferromagnetic nanowires. Their magnetic properties will be analyzed and discussed based on the different anisotropic behavior derived from their morphological and microstructural features.

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“…[8][9][10][11] Moreover, it is well known that the amount of disorder at the surfaces and interfaces, which is also influenced by process parameters, can greatly disturb the soft magnetic properties of thin films, such as coercivity, magnetic domain structure, magnetization reversal and magnetic anisotropy. [12][13][14][15][16][17] Therefore, when tailoring the soft magnetic multilayers for high-frequency operation it is important to predict and control the microstructure and surface/interface roughness.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the soft magnetic properties of sputtered multilayers by microstructure engineering for high frequency applications

Falub¹,

Rohrmann²,

Bless³

et al. 2017

AIP Advances

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Innovative soft magnetic multilayers with enhanced in-plane anisotropy and ferromagnetic resonance frequency for integrated RF passive devices AIP Advances 8, 048002 (2018) dielectric interlayers were deposited on 8" Si wafers using DC, pulsed DC and RF cathodes in the industrial, high-throughput Evatec LLS-EVO-II magnetron sputtering system. A typical multilayer consists of a bilayer stack up to 50 periods, with alternating (50-100) nm thick magnetic layers and (2-20) nm thick dielectric interlayers. We introduced the in-plane magnetic anisotropy in these films during sputtering by a combination of a linear magnetic field, seed layer texturing by means of linear collimators, and the oblique incidence inherent to the geometry of the sputter system. Depending on the magnetic material, the anisotropy field for these films was tuned in the range of ∼(7-120) Oe by choosing the appropriate interlayer thickness, the aspect ratios of the linear collimators in front of the targets, and the sputter process parameters (e.g. pressure, power, DC pulse frequency), while the coercivity was kept low, ∼(0.05-0.9) Oe. The alignment of the easy axis (EA) on the 8" wafers was typically between ±1.5 • and ±4 • . We discuss the interdependence of structure and magnetic properties in these films, as revealed by atomic force microscopy (AFM), X-ray reflectivity (XRR) with reciprocal space mapping (RSM) and magneto-optical Kerr effect (MOKE) measurements. © 2017 Author (s)

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Effect of surface roughness on magnetic domain wall thickness, domain size, and coercivity

Abstract: Effect of surface roughness on magnetic domain wall thickness, domain size, and coercivity Zhao, Y. P.; Gamache, R. M.; Wang, G. C.; Lu, T. M.; Palasantzas, G.; de Hosson, J. Th. M.

Cited by 164 publications

References 29 publications

Dependence of magnetic properties on micro- to nanostructure of CoNiFe films

Dependence of magnetic properties on micro- to nanostructure of CoNiFe films

Template Assisted Deposition of Ferromagnetic Nanostructures: from Antidot Thin Films to Multisegmented Nanowires

Tailoring the soft magnetic properties of sputtered multilayers by microstructure engineering for high frequency applications

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