Nucleation of stripe domains in thin ferromagnetic films

Singh, Sukriti; Gao, Hongze; Hartmann, Uwe

doi:10.1103/physrevb.98.060414

Cited by 7 publications

(3 citation statements)

References 63 publications

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“…This induced magnetic anisotropy can be attributed to the internal stress coupled with non‐zero magnetostriction coefficient and/or from columnar grains separated by nonmagnetic intergrain boundaries. [ 26 ] For films thicker than a critical thickness (≈200 nm), the stress‐induced anisotropy overcomes the shape anisotropy and the PMA becomes visible as Py domains arrange themselves in stripes (as indeed seen in the bottom inset of Figure 2a). For films below the critical thickness, the shape anisotropy masks the effect of the induced uniaxial anisotropy but the latter is expected to be stronger as the stress induced by the substrate tends to relax in thicker films.…”

Section: Resultsmentioning

confidence: 80%

Tunable Perpendicular Magnetoresistive Sensor Driven by Shape and Substrate Induced Magnetic Anisotropy

Barrera

Fourneau

Martín

et al. 2022

Advanced Sensor Research

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Control of magnetization reversal processes is a key issue for the implementation of magnetic materials in technological applications. The modulation of shape magnetic anisotropy in nanowire structures with a high aspect ratio is an efficient way to tune sharp in-plane magnetic switching. However, control of fast magnetization reversal processes induced by perpendicular magnetic fields is much more challenging. Here, tunable sharp magnetoresistance changes, triggered by out-of-plane magnetic fields, are demonstrated in thin permalloy strips grown on LaAlO 3 single crystal substrates. Micromagnetic simulations are used to evaluate the resistance changes of the strips at different applied field values and directions and correlate them with the magnetic domain distribution. The experimentally observed sharp magnetic switching, tailored by the shape anisotropy of the strips, is properly accounted for by numerical simulations when considering a substrate-induced uniaxial magnetic anisotropy. These results are promising for the design of magnetic sensors and other advanced magnetoresistive devices working with perpendicular magnetic fields by using simple structures.

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Section: Resultsmentioning

confidence: 80%

Tunable Perpendicular Magnetoresistive Sensor Driven by Shape and Substrate Induced Magnetic Anisotropy

Barrera

Fourneau

Martín

et al. 2022

Advanced Sensor Research

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show abstract

“…Typically, within such approaches the magnetostatic interaction associated with the stripe pattern is properly evaluated by taking into account a realistic, although simplified, magnetization profile across the stripes, such as in [18][19][20][21][22][23][24] (1D models), and/or across the film thickness, such as in [25,26] (2D models). Alternatively, a numerical micromagnetic calculation can be performed, but the limitation of such an approach is related to the finite size of the film plane [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

“…The subject is currently attracting wide interest, thanks to the central role played today by magnetic thin films with PMA in many applications, from memories to logic devices and sensors [52]. Current active research on PMA films and multilayers is focused onto the definition of magnetic phase diagrams into different systems where magnetic stripe and skyrmion or bubble phases compete [30,47,50,[53][54][55][56][57]. Nanoscale magnetic textures are today the focus of a wide area of research, thanks to the possibility of generating and controlling the propagation of domains, bubbles, skyrmions and other kinds of spin textures for realizing, e.g.…”

Section: Introductionmentioning

confidence: 99%

Stripe domains reorientation in ferromagnetic films with perpendicular magnetic anisotropy

et al. 2020

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Ferromagnetic thin films with moderate perpendicular magnetic anisotropy (PMA) are known to support weak stripe domains provided film thickness exceeds a critical value. In this work, we performed both an experimental and theoretical investigation of a peculiar phenomenon shown by weak stripe domains: namely, the stripe domains reorientation when a dc magnetic field is applied in the film plane along the direction perpendicular to the stripes axis. We focus on bct α′-Fe 8 N 1−x thin films obtained by + N 2 implantation of α-Fe films epitaxially grown on ZnSe/GaAs(001). By using different ion implantation and heat treatment conditions, we show that it is possible to tune the PMA values. Magnetic force microscopy and vibrating sample magnetometer measurements prove the existence of weak stripe domains at remanence, and of a threshold field for the reorientation of the stripes axis in a transversal field. Using a one-dimensional model of the magnetic stripe domains, where the essential parameter is the maximum canting angle of the stripe magnetization out of the film plane, the various contributions to the magnetic energy can be separately calculated. A linear increase of the reorientation threshold field on the PMA is obtained, in qualitative agreement with experimental data in our Fe-N films, as well as in other thin films with weak stripe domains. Finally, we find that also the rotatable anisotropy field linearly increases as a function of the PMA magnitude.

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3D Topological Toron‐Like Domains in Magnetic Nanoparticles: A Micromagnetic Simulation

Dong,

Liang,

Guo

et al. 2024

Advanced Physics Research

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Abstract3D topological textures have attracted significant attention from researchers due to their distinctive spatial arrangements and intriguing physical properties. However, investigating their topological domain structures at the submicron scale (<1000 nm) proves exceedingly elusive and under‐explored. Here, the size‐dependent behaviors of non‐uniform magnetic domain structures within submicron‐sized FeNi magnetic nanoparticles by micromagnetic simulations are systematically explored. Notably, the existence of magnetic toron‐like structures at the submicron scale and discuss their spatial arrangement and topological properties are identified. Furthermore, critical transition sizes are calculated under various aspect ratios, and the domain structure phase diagram based on nanoparticle size and aspect ratio is constructed. Through visualizations of domain flipping processes and dynamic energy changes, the stable existence of toron‐like magnetic configuration resulting from the competition among demagnetization energy, magnetic anisotropy energy, and magnetic exchange energy are unveiled. Finally, the utilization of core‐shell structures to achieve the stable existence of 3D topological textures are proposed. This work provides important theoretical insights for understanding and designing multi‐domain structures of FeNi nanoparticles at the submicron scale, as well as for constructing topological textures.

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Nucleation of stripe domains in thin ferromagnetic films

Cited by 7 publications

References 63 publications

Tunable Perpendicular Magnetoresistive Sensor Driven by Shape and Substrate Induced Magnetic Anisotropy

Tunable Perpendicular Magnetoresistive Sensor Driven by Shape and Substrate Induced Magnetic Anisotropy

Stripe domains reorientation in ferromagnetic films with perpendicular magnetic anisotropy

3D Topological Toron‐Like Domains in Magnetic Nanoparticles: A Micromagnetic Simulation

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