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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 (AHE). 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 the 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.

権利情報:

キーワード: anomalous Hall effect, topological materials, Weyl semimetal, magnetic sensors, read head, magnetic recording

刊行年月日: 2024-02-12

出版者: AIP Publishing

掲載誌:

• Applied Physics Letters (ISSN: 00036951)

研究助成金:

• Core Research for Evolutional Science and Technology JPMJCR21O1
• Ministry of Education, Culture, Sports, Science and Technology JPMXP1122715503

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4408

公開URL: https://doi.org/10.1063/5.0191974

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更新時刻: 2024-02-26 12:30:23 +0900

MDRでの公開時刻: 2024-02-26 12:30:24 +0900