Low-pass filters based on van der Waals ferromagnets

Li, Z and Liu, S and Sun, J and Zhu, J and Chen, Y and Yang, Y and Ai, L and Zhang, E and Huang, C and Leng, P and Zhao, M and Xie, X and Zhang, Y and Joseph, NB and Banerjee, R and Narayan, A and Zou, J and Liu, W and Xu, X and Xiu, F (2023) Low-pass filters based on van der Waals ferromagnets. In: Nature Electronics .

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Abstract

Two-dimensional (2D) magnets offer valuable electrical and mechanical properties, and could be used to create 2D nanoelectromechanical systems. However, the low Curie temperature of most 2D magnets limits practical applications. Here we report van der Waals ferromagnetic low-pass filters based on wafer-scale iron germanium telluride (Fe5+xGeTe2) thin films grown by molecular-beam epitaxy. We show that the Curie temperature of the Fe5+xGeTe2 system can be continuously modulated from 260 to 380 K via in situ iron doping. Few-layer Fe5+xGeTe2 is used to fabricate planar spiral inductors, with the 2D magnetic core providing inductance enhancement of 74% at room temperature compared with an inductor without the core. Low-pass Butterworth filters are then created from inductance–capacitance circuits built with these inductors. The filters offer a broad dynamic range of around 40 dB, and the –3 dB cut-off frequency can be tuned from 18 to 30 Hz by using different inductors in the inductance–capacitance circuit.

Item Type:	Journal Article
Publication:	Nature Electronics
Publisher:	Nature Research
Additional Information:	The copyright for this article belongs to Nature Research.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	02 May 2023 10:41
Last Modified:	02 May 2023 10:41
URI:	https://eprints.iisc.ac.in/id/eprint/81263

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