Low-pass filters based on van der Waals ferromagnets

DOI: 10.1038/s41928-023-00941-z

Authors: Zihan Li (Fudan University; Shanghai Qi Zhi Institute) , Shanshan Liu (Fudan University; Shanghai Qi Zhi Institute) , Jiabao Sun (Royal Holloway University of London) , Jiayi Zhu (University of Washington) , Yanhui Chen (Beijing University of Technology) , Yunkun Yang (Fudan University; Shanghai Qi Zhi Institute) , Linfeng Ai (Fudan University; Shanghai Qi Zhi Institute) , Enze Zhang (Fudan University; Shanghai Qi Zhi Institute) , Ce Huang (Fudan University; Shanghai Qi Zhi Institute) , Pengliang Leng (Fudan University; Shanghai Qi Zhi Institute) , Minhao Zhao (Fudan University; Shanghai Qi Zhi Institute) , Xiaoyi Xie (Fudan University; Shanghai Qi Zhi Institute) , Yuda Zhang (Fudan University; Shanghai Qi Zhi Institute) , Nesta Benno Joseph (Indian Institute of Science) , Rajdeep Banerjee (Indian Institute of Science) , Awadhesh Narayan (Indian Institute of Science) , Jin Zou (The University of Queensland) , Wenqing Liu (Royal Holloway University of London) , Xiaodong Xu (University of Washington) , Faxian Xiu (Fudan University; Shanghai Qi Zhi Institute Shanghai Research Center for Quantum Sciences)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Electronics , VOL 306

State: Published (Approved)
Published: March 2023
Diamond Proposal Number(s): 22532

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.

Diamond Keywords: Ferromagnetism

Subject Areas: Physics, Materials


Instruments: I10-Beamline for Advanced Dichroism

Added On: 28/03/2023 20:50

Discipline Tags:

Quantum Materials Physics Electronics Magnetism Materials Science interfaces and thin films

Technical Tags:

Spectroscopy Circular Dichroism (CD) X-ray Absorption Spectroscopy (XAS) X-ray Magnetic Circular Dichroism (XMCD)