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Recent advances in the study of materials with topological electronic bandstructures have revealed magnetic materials exhibiting giant anomalous Halleffects (AHE). The giant AHE has not only attracted the research interest inits mechanism but also opened up the possibility of practical application inmagnetic sensors. In this article, we describe simulation-based investigationsof AHE magnetic sensors for the applications to read head sensors (readers) ofhard disk drives. With the shrinking of magnetic recording patterns, the readertechnology, which currently uses multilayer-based tunnel magnetoresistance(TMR) devices, is associated with fundamental challenges, such as insufficientspatial resolution and signal-to-noise ratio (SNR) in sensors with dimensionsbelow 20 nm. The structure of an AHE-based device composed of a singleferromagnetic material is advantageous for magnetic sensors with nanoscaledimensions. We found that AHE readers using topological ferromagnets with giantAHE, such as Co2MnGa, can achieve a higher SNR than current TMR readers. Thehigher SNR originates from the large output signal of the giant AHE as well asfrom the reduced thermal magnetic noise, which is the dominant noise in TMRreaders. We highlight a major challenge in the development of AHE readers: thereduction in the output signal due to the shunting of the bias current and theleakage of the Hall voltage through the soft magnetic shields surrounding theAHE reader. We propose reader structures that overcome this challenge. Finally,we discuss the scope for future research to realize AHE readers.

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