Crossover in the surface anisotropy contributions of ferromagnetic films on rippled Si surfaces

Liedke, Maciej Oskar; Körner, Michael; Lenz, K.; Fritzsche, Monika; Ranjan, Mukesh; Keller, Adrian; Čižmár, E.; Zvyagin, S. A.; Facsko, Stefan; Potzger, К.; Lindner, J.; Faßbender, J.

doi:10.1103/physrevb.87.024424

Cited by 62 publications

(61 citation statements)

References 32 publications

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“…In contrast, above this threshold the corrugated Permalloy film acted as a flat film. More recently, the same group has studied how the uniaxial magnetic anisotropy (UMA), induced in a ferromagnetic film by the underlying IBS rippled Si substrate, depends on the film thickness [281]. In fact, an abrupt transition was observed, since for a thin film regime there is a corrugated alignment of the magnetic moments and above a critical thickness there are dipolar interactions due to the sinusoidal surface modulations.…”

Section: Applicationsmentioning

confidence: 99%

Self-organized nanopatterning of silicon surfaces by ion beam sputtering

Muñoz-García

Vázquez

Castro

et al. 2014

Materials Science and Engineering: R: Reports

155

197

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Section: Applicationsmentioning

confidence: 99%

Self-organized nanopatterning of silicon surfaces by ion beam sputtering

Muñoz-García

Vázquez

Castro

et al. 2014

Materials Science and Engineering: R: Reports

155

197

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“…Based on the comparable values of K u and K s in Table I for samples 3 and 4, we conclude that the UMA inferred from the magnetization reversal is dominated by the anisotropic surface roughness resulting from the grazing-incidence ion beam sputtering [7,12].…”

Section: B Magnetization Reversalmentioning

confidence: 66%

“…Bisio et al employed ion beam sputtering to achieve step-induced UMA in Fe films on flat Ag (001) substrates [10]. Liedke et al engineered the UMA of ferromagnetic thin films without affecting the intrinsic cubic anisotropy by creating nanoscale ripples on various substrates prior to the film deposition [11,12].…”

Section: Introductionmentioning

confidence: 99%

Tailoring the magnetic anisotropy, magnetization reversal, and anisotropic magnetoresistance of Ni films by ion sputtering

et al. 2015

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We studied surface morphology induced changes of magnetic anisotropy, magnetization reversal, and symmetry of the anisotropic magnetoresistance (AMR) in ion sputtered Ni films grown on MgO (001). Grazing-incidence ion sputtering generally develops anisotropic surface roughness of the Ni films, i.e., nanometer wide ripples parallel to the ion beam direction, giving rise to uniaxial magnetic anisotropy with the easy axis along the ion beam direction. The formed ripples act as domain wall nucleation and pinning sites during magnetization reversal, while two-jump domain wall motion dominates in the as-grown Ni films. More importantly, the azimuthal angular dependence of the AMR indicates a superposition of twofold symmetry and fourfold symmetry. By relying on grazing-incidence ion sputtering along specific crystallographic directions, we are able to tailor the relative weight of twofold and fourfold symmetry of AMR. We demonstrate that in contrast to the bulk case, the symmetry of the AMR becomes also sensitive to the surface morphology in thin films, which is in particular relevant for the design of magnetotransport based sensors.

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“…In other words, although the thermally-induced disorder/order phase transition is more homogeneous for thinner nanowires, the corresponding degree of chemical ordering also drops dramatically. [53][54][55] Nevertheless, the hysteresis loops measured with the magnetic field applied parallel to the as-deposited FePt nanowires are slightly sheared. 10,50 In particular, the large values of mean square relative displacement, σ 2 , tend to confirm that our FePt nanowires are not highly crystallized.…”

Section: Structure and Local Atomic Ordermentioning

confidence: 99%

Self-organized ultrathin FePt nanowires produced by glancing-angle ion-beam codeposition on rippled alumina surfaces

et al. 2015

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Ultradense macroscopic arrays of ferromagnetic alloy nanowires exhibit unique properties that make them attractive both for basic physics studies and for prospective nanodevice applications in various areas. We report here on the production of self-organized equiatomic FePt nanowires produced by glancing-angle ion-beam codeposition on alumina nanoripple patterns at room temperature and subsequent annealing at 600 °C. This study demonstrates that periodically aligned FePt nanowires with tunable size (∼10-20 nm width and ∼0.5-10 nm height) can be successfully grown as a consequence of shadowing effects and low mobility of Fe and Pt on the rippled alumina surface. Moreover, the structure and magnetic properties of the FePt nanowires, which undergo a phase transition from a disordered A1 (soft) structure to a partially ordered L10 (hard) structure, can be modified upon annealing. We show that this behavior can be further exploited to change the effective uniaxial anisotropy of the system, which is determined by a strong interplay between the shape and magnetocrystalline anisotropies of the nanowires.

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Crossover in the surface anisotropy contributions of ferromagnetic films on rippled Si surfaces

Cited by 62 publications

References 32 publications

Self-organized nanopatterning of silicon surfaces by ion beam sputtering

Self-organized nanopatterning of silicon surfaces by ion beam sputtering

Tailoring the magnetic anisotropy, magnetization reversal, and anisotropic magnetoresistance of Ni films by ion sputtering

Self-organized ultrathin FePt nanowires produced by glancing-angle ion-beam codeposition on rippled alumina surfaces

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