Probing Local Magnetization Dynamics and Static Interactions at Interfaces

Interactions across  magnetic/non-magnetic interfaces play a dominant role in spin based information manipulation and transport.  High resolution spectroscopic measurement of static interfacial interactions and local characterization of magnetization dynamics provide important insight into the mechanisms underlying these phenomena.  Here we discuss two high sensitivity magnetic resonance techniques that enable local measurement of these quantities.  Scanned force magnetic resonance measurement of magnetic tip-localized spin wave modes allows  spatially resolved measurement of both local magnetic dynamics and static interfacial interactions with Gauss-scale spectroscopic resolution.  The photoluminescence of nitrogen-vacancy (NV) defects in diamond and boron-vacancy (BV) centers in hBN is sensitive to magnetic fluctuations generated by a nearby sample; this enables local measurement of magnetization dynamics.  We close with illustrations of these approaches: scanned imaging of  WTe2/YIG interfaces [1] and detection of AF resonance in CrCl3 [2].

 

1.  "Enhancing Perpendicular Magnetic Anisotropy in Garnet Ferrimagnet by Interfacing with

Few-Layer WTe2," Guanzhong Wu, Dongying Wang, Nishchhal Verma, Rahul Rao, Yang

Cheng, Side Guo, Guixin Cao, Kenji Watanabe, Takashi Taniguchi, Chun Ning Lau, Fengyuan

Yang, Mohit Randeria, Marc Bockrath, and P. Chris Hammel, Nano Letters,

22(3): 1115-1121 (2022) DOI: 10.1021/acs.nanolett.1c04237

 

2.  "Optical detection of antiferromagnetic dynamics in CrCl3," Shekhar Das, Alex L. Melendez, I-Hsuan Kao, Francisco Ayala Rodriguez, Simranjeet Singh and, P. Chris Hammel, in preparation