Modification of the anomalous Hall effect in Fe films by <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si17.svg"><mml:mrow><mml:mi>δ</mml:mi></mml:mrow></mml:math>-doping Bi impurities with strong spin-orbit coupling

Li, Jiajia; Yue, Di; Xu, Jiaying; X, Jin

doi:10.1016/j.jmmm.2021.167978

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…To enhance the AHE via an extrinsic mechanism, alloying, doping, and multilayering of heavy elements with large spin-orbit interactions, such as Pt, have been demonstrated. [7][8][9][10] The other mechanism is an intrinsic mechanism due to the electronic band structure of the material. 11,12 The intrinsic AHE is related to the Berry curvature in the momentum space originating from the electronic structure of the material.…”

Section: Introduction: Anomalous Hall Effect Materials and Magnetic S...mentioning

confidence: 99%

Perspective on nanoscale magnetic sensors using giant anomalous Hall effect in topological magnetic materials for read head application in magnetic recording

Nakatani,

Kulkarni,

Suto

et al. 2024

Applied Physics Letters

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Recent advances in the study of materials with topological electronic band structures have revealed magnetic materials exhibiting giant anomalous Hall effects (AHEs). The giant AHE has not only attracted the research interest in its mechanism but also opened up the possibility of practical application in magnetic sensors. In this article, we describe simulation-based investigations of AHE magnetic sensors for applications to read head sensors (readers) of hard disk drives. With the shrinking of magnetic recording patterns, the reader technology, which currently uses multilayer-based tunnel magnetoresistance (TMR) devices, is associated with fundamental challenges, such as insufficient spatial resolution and signal-to-noise ratio (SNR) in sensors with dimensions below 20 nm. The structure of an AHE-based device composed of a single ferromagnetic material is advantageous for magnetic sensors with nanoscale dimensions. We found that AHE readers using topological ferromagnets with giant AHE, such as Co2MnGa, can achieve a higher SNR than current TMR readers. The higher SNR originates from the large output signal of the giant AHE as well as from the reduced thermal magnetic noise, which is the dominant noise in TMR readers. We highlight a major challenge in the development of AHE readers: the reduction in the output signal due to the shunting of the bias current and the leakage of the Hall voltage through the soft magnetic shields surrounding the AHE reader. We propose reader structures that overcome this challenge. Finally, we discuss the scope for future research to realize AHE readers.

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Section: Introduction: Anomalous Hall Effect Materials and Magnetic S...mentioning

confidence: 99%

Perspective on nanoscale magnetic sensors using giant anomalous Hall effect in topological magnetic materials for read head application in magnetic recording

Nakatani,

Kulkarni,

Suto

et al. 2024

Applied Physics Letters

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Sign change of competing contributions to the side jump by impurity, phonon, and magnon scattering

et al. 2023

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Extrinsic contribution to the anomalous Hall effect and Nernst effect in Fe3Co single-crystal thin films by Ir doping

Toyama,

Zhou,

Sakuraba

2024

Phys. Rev. B

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Modification of the anomalous Hall effect in Fe films by δ-doping Bi impurities with strong spin-orbit coupling

Cited by 3 publications

References 13 publications

Perspective on nanoscale magnetic sensors using giant anomalous Hall effect in topological magnetic materials for read head application in magnetic recording

Perspective on nanoscale magnetic sensors using giant anomalous Hall effect in topological magnetic materials for read head application in magnetic recording

Sign change of competing contributions to the side jump by impurity, phonon, and magnon scattering

Extrinsic contribution to the anomalous Hall effect and Nernst effect in Fe3Co single-crystal thin films by Ir doping

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