Two-magnon scattering in permalloy thin films due to rippled substrates

Körner, Michael; Lenz, K.; Gallardo, R. A.; Fritzsche, Monika; Mücklich, A.; Facsko, Stefan; Lindner, J.; Landeros, P.; Faßbender, J.

doi:10.1103/physrevb.88.054405

Cited by 65 publications

(41 citation statements)

References 38 publications

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“…Both direct observations—stray field and magnetization alignment—are in qualitative agreement, that is, in the same order of magnitude and at the predicted positions of the ripple flanks, with predictions made by micromagnetic simulations. This is an essential proof for dipole field induced effects acting on the uniaxial magnetic anisotropy, the Néel coupling, or the two‐magnon scattering in nano‐modulated thin films. Quantitative agreement additionally requires the consideration of the exact three‐dimensional structure of the FIB‐lamella with a spatial resolution of a few nanometers (a 2D projection had to be used instead) and sufficient computation power, which were both not reachable recently.…”

Section: Resultsmentioning

confidence: 88%

“…Furthermore, if thin ferromagnetic films are grown, the periodical ripple morphology influences the magnetic anisotropy, the magnetization dynamics, and, in case of magnetic multilayers, especially the Néel coupling . In terms of magnetic anisotropy, rippled layers may be used to induce an additional uniaxial magnetic anisotropy (given by the ripple direction), and thus enabling anisotropy engineering of a given magnetic system by simply changing the surface modulation via the substrate .…”

Section: Introductionmentioning

confidence: 99%

“…The dipolar stray fields arising from the rippled film also strongly modify the dispersion relation of the spin waves such that degenerate magnon states exist. They are the reason for magnon–magnon scattering in thin films and periodic magnetic nanostructures like magnonic crystals, which in the end allow to modify the damping and microwave transmission properties. There, spinwaves are scattered, for example, due to periodic stray fields, which in turn influence the magnetization relaxation properties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantitative Imaging of the Magnetic Configuration of Modulated Nanostructures by Electron Holography

Körner

Röder

Lenz

et al. 2014

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By means of off-axis electron holography the local distribution of the magnetic induction within and around a poly-crystalline Permalloy (Ni81Fe19) thin film is studied. In addition the stray field above the sample is measured by magnetic force microscopy on a larger area. The film is deposited on a periodically nanostructured (rippled) Si substrate, which was formed by Xe(+) ion beam erosion. This introduces the periodical ripple shape to the Permalloy film. The created ripple morphology is expected to modify the magnetization distribution within the Permalloy and to induce dipolar stray fields. These stray fields play an important role in spinwave dynamics of periodic nanostructures like magnonic crystals. Micromagnetic simulations estimate those stray fields in the order of only 10 mT. Consequently, their experimental determination at nanometer spatial resolution is highly demanding and requires advanced acquisition and reconstruction techniques such as electron holography. The reconstructed magnetic phase images show the magnetized thin film, in which the magnetization direction follows mainly the given morphology. Furthermore, a closer look to the Permalloy/carbon interface reveals stray fields at the detection limit of the method in the order of 10 mT, which is in qualitative agreement with the micromagnetic simulations.

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Section: Resultsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantitative Imaging of the Magnetic Configuration of Modulated Nanostructures by Electron Holography

Körner

Röder

Lenz

et al. 2014

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“…[30,46]. Excitation of the spin system is achieved by coupling a microwave signal via a coplanar waveguide to the surface of a 'flip-chip'-mounted sample.…”

Section: Magnetic Characterizationmentioning

confidence: 99%

Role of internal demagnetizing field for the dynamics of a surface-modulated magnonic crystal

et al. 2017

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Magnonic crystals with locally alternating properties and specific periodicities exhibit interesting effects, such as a multitude of different spin-wave states and large band gaps. This work aims for demonstrating and understanding the key role of local demagnetizing fields in such systems. To achieve this, hybrid structures are investigated consisting of a continuous thin film with a stripe modulation on top favorable due to the adjustability of the magnonic effects with the modulation size. For a direct access to the spin dynamics, a magnonic crystal was reconstructed from 'bottom-up', i.e., the structural shape as well as the internal field landscape of the structure were experimentally obtained on the nanoscale using electron holography. Subsequently, both properties were utilized to perform dynamic response calculations. The simulations yield the frequency-field dependence as well as the angular dependence of spin waves in a magnonic crystal and reveal the governing role of the internal field landscape around the backward-volume geometry. The complex angle-dependent spin-wave behavior is described for a 360• in-plane rotation of an external field by connecting the internal field landscape with the individual spin-wave localization.

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“…On the other hand, a non-linearity as a signature of TMS, was observed in all samples. We calculated the magnon wave vector ( k 0 ) at which the spin wave energy degenerates with the uniform modes ω(k 0 ) = 2πf for a given propagation direction ϕ with respect to magnetization in the film plane [55,56]. The total contribution to TMS was then estimated using [57,58] : …”

Section: Structure and Chemical Orderingmentioning

confidence: 99%

Tunable magnetization relaxation of Fe2Cr1−xCoxSi half-metallic Heusler alloys by band structure engineering

Liu

Zheng

et al. 2017

Phys. Rev. Materials

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We report a systematic investigation on the magnetization relaxation properties of iron-based half-metallic Heusler alloy Fe 2 Cr 1-x Co x Si (FCCS) thin films using broadband angular-resolved ferromagnetic resonance. Band structure engineering through Co doping (x) demonstrated by first principles calculations is shown to tune the intrinsic magnetic damping over an order of magnitude namely, 1 × 10 −2 -8 × 10 −4 . Notably,

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Two-magnon scattering in permalloy thin films due to rippled substrates

Cited by 65 publications

References 38 publications

Quantitative Imaging of the Magnetic Configuration of Modulated Nanostructures by Electron Holography

Quantitative Imaging of the Magnetic Configuration of Modulated Nanostructures by Electron Holography

Role of internal demagnetizing field for the dynamics of a surface-modulated magnonic crystal

Tunable magnetization relaxation of Fe2Cr1−xCoxSi half-metallic Heusler alloys by band structure engineering

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