Thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films

Silva, E F; Corrêa, M.A.; Pace, R.D. Della; Cid, Cristiani Campos Plá; Kern, P.R.; Carara, M.; Chesman, C.; Santos, O. Alves; Rodrı́guez-Suárez, R. L.; Azevedo, A.; Rezende, S. M.; Bohn, F.

doi:10.1088/1361-6463/aa6665

Cited by 35 publications

(17 citation statements)

References 67 publications

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“…Figure 6 shows representative domain images ilustrating the evolution of the magnetic domain structure with thickness. It is noteworthy that similar domain patterns have previously been reported for polycrystalline and amorphous samples with different compositions 15 , 43 , 56 , 58 – 60 . The thickness dependence of the magnetic properties and domain structure has been focus of many investigations in the last decades and, nowadays, despite the complexity of the issue, its main aspects are well understood 14 , 15 .…”

Section: Discussionsupporting

confidence: 86%

Playing with universality classes of Barkhausen avalanches

Bohn

Durin

Corrêa

et al. 2018

Sci Rep

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Many systems crackle, from earthquakes and financial markets to Barkhausen effect in ferromagnetic materials. Despite the diversity in essence, the noise emitted in these dynamical systems consists of avalanche-like events with broad range of sizes and durations, characterized by power-law avalanche distributions and typical average avalanche shape that are fingerprints describing the universality class of the underlying avalanche dynamics. Here we focus on the crackling noise in ferromagnets and scrutinize the traditional statistics of Barkhausen avalanches in polycrystalline and amorphous ferromagnetic films having different thicknesses. We show how scaling exponents and average shape of the avalanches evolve with the structural character of the materials and film thickness. We find quantitative agreement between experiment and theoretical predictions of models for the magnetic domain wall dynamics, and then elucidate the universality classes of Barkhausen avalanches in ferromagnetic films. Thereby, we observe for the first time the dimensional crossover in the domain wall dynamics and the outcomes of the interplay between system dimensionality and range of interactions governing the domain wall dynamics on Barkhausen avalanches.

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Section: Discussionsupporting

confidence: 86%

Playing with universality classes of Barkhausen avalanches

Bohn

Durin

Corrêa

et al. 2018

Sci Rep

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“…In particular, from the perspective of advancing the spin logic device, the existence of atomically-thin permanent magnets would mean that conventional FM thin films can be replaced by a highly scalable, novel spin injector (or detector) material. This is important because conventional FM thin films with thicknesses of less than 200 nm typically experience noticeable changes in their magnetic properties such as magnetic anisotropy 107 . It is also known that for the magnetic thin films even in the monolayer or few-layer range, the magnetic ordering (Curie) temperature is strongly affected by a variety of topological effects such as vacancies, substrate roughness and atomic intermixing, and incomplete crystal structures 108 .…”

Section: Spin Transport and Relaxation In Graphenementioning

confidence: 99%

2D materials for spintronic devices

2020

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2D materials are attractive for nanoelectronics due to their ultimate thickness dimension and unique physical properties. A wide variety of emerging spintronic device concepts will greatly benefit from the use of 2D materials, leading a better way to manipulating spin. In this review, we discuss various 2D materials, including graphene and other inorganic 2D semiconductors, in the context of scientific and technological advances in spintronic devices. Applications of 2D materials in spin logic switches, spin valves, and spin transistors are specifically investigated. We also introduce the spin-orbit and spin-valley coupled properties of 2D materials to explore their potential to address the crucial issues of contemporary electronics. Finally, we highlight major challenges in integrating 2D materials into spintronic devices and provide a future perspective on 2D materials for spin logic devices.

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“…Detailed information on structural and magnetic characterizations may be found in refs. 8,9,24,25,[36][37][38][39] .…”

Section: Methodsmentioning

confidence: 99%

Waiting-time statistics in magnetic systems

Sousa

Lima

Corrêa

et al. 2020

Sci Rep

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Many complex systems, from earthquakes and financial markets to Barkhausen effect in ferromagnetic materials, respond with a noise consisting of discrete avalanche-like events with broad range of sizes and durations, separated by waiting times. Here we focus on the waiting-time statistics in magnetic systems. By investigating the Barkhausen noise in amorphous and polycrystalline ferromagnetic films having different thicknesses, we uncover the form of the waiting-time distribution in time series recorded from the irregular and irreversible motion of magnetic domain walls. Further, we address the question of if the waiting-time distribution evolves with the threshold level, as well as with the film thickness and structural character of the materials. Our results, besides informing on the temporal avalanche correlations, disclose the waiting-time statistics in magnetic systems also bring fingerprints of the universality classes of Barkhausen avalanches and a dimensional crossover in the domain wall dynamics.

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Thickness dependence of the magnetic anisotropy and dynamic magnetic response of ferromagnetic NiFe films

Cited by 35 publications

References 67 publications

Playing with universality classes of Barkhausen avalanches

Playing with universality classes of Barkhausen avalanches

2D materials for spintronic devices

Waiting-time statistics in magnetic systems

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