Influence of perpendicular magnetic fields on the domain structure of permalloy microstructures grown on thin membranes

Dietrich, Christian; Hertel, Riccardo; Huber, M.; Weiss, Dieter; Schäfer, Rudolf; Zweck, Josef

doi:10.1103/physrevb.77.174427

Cited by 25 publications

(16 citation statements)

References 56 publications

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“…The curvature-induced magnetochirality effects are already known for domain structure (twisting of domains) [8], spin waves (asymmetry in the spin waves propagation in nanotubes) [12]. Its analogy with the Dzyaloshinskii-Moriya interaction was discussed in Ref.…”

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confidence: 95%

“…Curvature-driven modification of physical properties of systems with nontrivial geometry is the subject of intensive research in various areas of physics [1,2], e.g., electronic properties of graphene [3], molecular alignment in liquid crystals [4], physics of superconductors [5,6], and macromolecular structures [7]. In physics of nanomagnetism, it is possible to distinguish two groups of curvature-induced effects, namely, magnetochiral effects [8][9][10] and topologically induced magnetization patterning [10,11]. The first family unites the phenomena of curvature-induced chiral symmetry breaking [12].…”

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confidence: 99%

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Coupling of Chiralities in Spin and Physical Spaces: The Möbius Ring as a Case Study

et al. 2015

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We show that the interaction of the magnetic subsystem of a curved magnet with the magnet curvature results in the coupling of a topologically nontrivial magnetization pattern and topology of the object. The mechanism of this coupling is explored and illustrated by an example of a ferromagnetic Möbius ring, where a topologically induced domain wall appears as a ground state in the case of strong easy-normal anisotropy. For the Möbius geometry, the curvilinear form of the exchange interaction produces an additional effective Dzyaloshinskii-like term which leads to the coupling of the magnetochirality of the domain wall and chirality of the Möbius ring. Two types of domain walls are found, transversal and longitudinal, which are oriented across and along the Möbius ring, respectively. In both cases, the effect of magnetochirality symmetry breaking is established. The dependence of the ground state of the Möbius ring on its geometrical parameters and on the value of the easy-normal anisotropy is explored numerically.

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confidence: 95%

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confidence: 99%

Coupling of Chiralities in Spin and Physical Spaces: The Möbius Ring as a Case Study

et al. 2015

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“…Assessing spin textures of three-dimensionally curved magnetic thin films 1 2 3 , hollow cylinders 4 5 6 or wires 7 8 9 10 has become a dynamic research field. These 3D-shaped systems possess striking novel fundamental properties originating from the curvature-driven effects, such as magnetochiral effects 3 11 12 13 and topologically induced magnetization patterns 13 14 15 . To this end, a general fully 3D approach was put forth recently to study dynamical and static properties of arbitrary curved magnetic shells and wires 16 17 .…”

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confidence: 99%

Rashba Torque Driven Domain Wall Motion in Magnetic Helices

Pylypovskyi

Sheka

Kravchuk

et al. 2016

Sci Rep

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Manipulation of the domain wall propagation in magnetic wires is a key practical task for a number of devices including racetrack memory and magnetic logic. Recently, curvilinear effects emerged as an efficient mean to impact substantially the statics and dynamics of magnetic textures. Here, we demonstrate that the curvilinear form of the exchange interaction of a magnetic helix results in an effective anisotropy term and Dzyaloshinskii–Moriya interaction with a complete set of Lifshitz invariants for a one-dimensional system. In contrast to their planar counterparts, the geometrically induced modifications of the static magnetic texture of the domain walls in magnetic helices offer unconventional means to control the wall dynamics relying on spin-orbit Rashba torque. The chiral symmetry breaking due to the Dzyaloshinskii–Moriya interaction leads to the opposite directions of the domain wall motion in left- or right-handed helices. Furthermore, for the magnetic helices, the emergent effective anisotropy term and Dzyaloshinskii–Moriya interaction can be attributed to the clear geometrical parameters like curvature and torsion offering intuitive understanding of the complex curvilinear effects in magnetism.

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“…Possibly, the trajectories in the experiments show lower ellipticities than expected from the Thiele model. This might be due to a concentric deformation of the disks that arises from surface tensions in the membrane on which the microstructures are fabricated [Die08].…”

Section: A2 Model Parametersmentioning

confidence: 99%

Self-organized state formation in magnonic vortex crystals

et al. 2013

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Complexity created by periodic arrangement of well-understood building blocks plays an important role in biochemistry, photonics, engineering and nanoelectrics. The periodic arrangement of atoms or molecules as basis determines the physical properties of crystals. With the flexibility of nanometer precise electron-beam lithography here magnetic interactions are engineered yielding two-dimensional magnonic crystals that benefit from the magnetic vortex core as crystal basis. Using scanning transmission X-ray microscopy at the MAXYMUS beamline at BESSY II in Berlin, Germany the magnonic crystal dynamics are imaged with time resolution in the sub-nanosecond regime and simultaneous spatial resolution on the nanometer scale. Self-organized vortex core state formation by adiabatic reduction of a high frequency magnetic field excitation is observed. The emerging polarization states are shown to depend on the frequency of excitation and the strength of the dipolar interaction between the elements. In spite of the complexity of the investigated system, global order caused by local interactions creates polarization states with a high degree of symmetry. An analytical dipole model and numerically solved coupled equations of motion are adopted to analytically describe the experimental results. The emerging states can be predicted by a fundamental stability criterion based on the excitability of eigenmodes in the crystal. Further experiments with ferromagnetic absorption spectroscopy are carried out that give insight into the characteristic frequencies of the vortex dynamics that are crucially influenced by the self-organized state formation. This is emphasized with experiments on benzene-like magnetic vortex molecules whose motions show strong similarities to the vibrational modes of the actual benzene molecule (C 6 H 6 ). The symmetry of both systems determines the motions of the oscillators, i.e., the carbon atoms or the magnetic vortices. This allows to simplify the derivation of the fundamentally different dispersion relations depending on the previously tuned polarization state. The experiments confirm the calculations and prove that the magnetic vortex molecule features a reprogrammable band structure or dispersion relation. Consequently, this work allows further research studies to tailor the characteristic properties of various magnetic vortex arrangements by tuning the polarization state. I KurzzusammenfassungDas Zusammenspiel einer Vielzahl gleichartiger, gut verstandener Bausteine spielt eine entscheidende Rolle in vielen komplexen Systemen verschiedenster wissenschaftlicher Disziplinen wie Biochemie, Photonik, Ingenieurswissenschaften oder Nanoelektronik. Zum Beispiel bestimmen periodische Anordnungen von Atomen oder Molekülen die physikalischen Eigenschaften von Kristallen. In dieser Arbeit werden magnetisch wechselwirkende Wirbel, sogenannte magnetische Vortizes, zu magnonischen Kristallen angeordnet. Die verwendete Elektronenstrahl-Lithographie erlaubt es, die Vortizes mit Nanometer-Präzision herzustellen und ...

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Influence of perpendicular magnetic fields on the domain structure of permalloy microstructures grown on thin membranes

Cited by 25 publications

References 56 publications

Coupling of Chiralities in Spin and Physical Spaces: The Möbius Ring as a Case Study

Coupling of Chiralities in Spin and Physical Spaces: The Möbius Ring as a Case Study

Rashba Torque Driven Domain Wall Motion in Magnetic Helices

Self-organized state formation in magnonic vortex crystals

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