Linear chains of nanomagnets: engineering the effective magnetic anisotropy

Talapatra, A.; Adeyeye, A. O.

doi:10.1039/d0nr06026g

Cited by 8 publications

(9 citation statements)

References 44 publications

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“…For future research, several directions can be highlighted. The resonant frequency can be boosted by thin film patterning [47] or by using synthetic antiferromagnets (SAF) [48] and ferrimagnets [49] instead of Permalloy. Another promising area of research is the light control of magnetism which allows for reaching the faster terahertz range [50].…”

Section: Nonreciprocitymentioning

confidence: 99%

Control of Dynamics in Weak PMA Magnets

Álvarez-Prado

2021

Magnetochemistry

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We have recently shown that a hybrid magnetic thin film with orthogonal anisotropies presenting weak stripe domains can achieve a high degree of controllability of its ferromagnetic resonance. This work explores the origin of the reconfigurability through micromagnetic simulations. The static domain structures which control the thin film resonance can be found under a deterministic applied field protocol. In contrast to similar systems reported, our effect can be obtained under low magnetic fields. We have also found through simulations that the spin wave propagation in the hybrid is nonreciprocal: two adjacent regions emit antiparallel spin waves along the stripe domains. Both properties convert the hybrid in a candidate for future magnonic devices at the nanoscale.

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Section: Nonreciprocitymentioning

confidence: 99%

Control of Dynamics in Weak PMA Magnets

Álvarez-Prado

2021

Magnetochemistry

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“…With micromagnetic simulation by solving the Landau-Lifshitz-Gilbert equation [21], the magnetization dynamics can be obtained [2,20]. The data from simulation can be used to analyze diverse phenomena, such as ferromagnetic resonance (FMR) [22,23], spin wave dynamics [24,25], domain wall motion [26,27], etc.…”

Section: Introductionmentioning

confidence: 99%

Splitting phenomenon of ferromagnetic resonance spectra in NiFe films deposited on periodically rippled sapphire substrates

Xu,

Zheng,

Jin

et al. 2023

J. Phys.: Condens. Matter

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The splitting phenomenon of ferromagnetic resonance (FMR) spectra of Ni80Fe20 (NiFe) films deposited on periodically rippled sapphire substrates is studied experimentally and with the help of micromagnetic simulation. The analyses show that the splitting of FMR spectra is related to the periodic ripple topography of films. When the applied magnetic field is perpendicular to the ripple direction, the effective field of periodically rippled films becomes inhomogeneous. The splitting of ferromagnetic resonance spectra originates from localized FMR peaks corresponding to different regions with different effective field intensities in the rippled structure. Furthermore, the relative intensity and position between the split mode and the main FMR mode can be changed by designing ripple topography. This work would help understand the splitting phenomenon of FMR spectra for these NiFe films deposited on the periodically rippled sapphire substrates.

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“…The magnetic configuration can be regulated via modulating the size, morphology, and composition of the crystals based on the minimization energy principle . Geometric regulations like adjusting anisotropy, the length to diameter ratio, and assembling are efficient strategies to fabricate magnetic materials with distinctive morphology and size, which make it feasible to obtain the stable combination of multiple vortex domains. Particularly, when assembled with various dimensional building blocks such as nanoparticles, − nanowires, , nanosheets, , and nanospheres, , the magnetic structures could achieve the synergistic effect from different units with spatial confinement and the pluralism of mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Morphology-Evolved Succulent-like FeCo Microarchitectures with Magnetic Configuration Regulation for Enhanced Microwave Absorption

Yang

You

Xiong

et al. 2022

ACS Appl. Mater. Interfaces

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The regulation of magnetic configuration through diverse morphologies to achieve a rapid magnetic response has attracted considerable academic favor on account of the unique application prospects in various fields. Herein, porous FeCo alloys with morphology evolved from spheres to succulent-like microstructures are successfully constructed via a facile hydrothermal reaction−hydrogen reduction synthetic strategy. A multiple balance/competition mechanism is proposed, including the coexistence of the dissolution−precipitation balance of hydroxides and the dissociation−stability balance of coordination compounds, the Fe 3+ − Co 2+ competition, and the precipitation−coordination reaction contest. As the morphology evolves to a succulent-like assembly, the multidomain features with a stable combination of vortex states and the violent motion of magnetic vectors contribute to the improvement of magnetic storage capacity and loss capability, which are evidenced by the off-axis electron holography and micromagnetic simulation. Consequently, the succulent-like FeCo exhibits enhanced permeability and microwave absorption performance. The effective absorption bandwidth reaches 5.68 GHz, and the maximum reflection loss is elevated to −53.81 dB. This work sheds considerable insight into the microstructure regulation with an application in microwave absorption and offers guidance in research for the topological magnetic configuration and dynamic response mechanism of magnetic alloys.

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Linear chains of nanomagnets: engineering the effective magnetic anisotropy

Abstract: Tunable effective magnetic anisotropy is achieved by engineering the thickness and lattice arrangement of linear chains of nanomagnets.

Cited by 8 publications

References 44 publications

Control of Dynamics in Weak PMA Magnets

Control of Dynamics in Weak PMA Magnets

Splitting phenomenon of ferromagnetic resonance spectra in NiFe films deposited on periodically rippled sapphire substrates

Morphology-Evolved Succulent-like FeCo Microarchitectures with Magnetic Configuration Regulation for Enhanced Microwave Absorption

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