Stress Generation in Terfenol-D Using HBAR for NV Center Based Hybrid Sensor

The applications for nanoscale local stress sensing span a wide range of fields. The hybrid sensor we study here utilizes the ultrasensitive magnetic field response of the nitrogen vacancy center (NV-center) in diamond in conjunction with the magnetostrictive property of Terfenol-D. We propose and simulate a device model for the experimental verification of local nanoscale stress sensing. We generate spatially varying stress in Terfenol-D with the help of the high-overtone bulk acoustic resonator (HBAR) which is then converted to the magnetic field via the Villari effect. We calculate the stress tensor of Terfenol-D, which is then fed into micromagnetic simulator to obtain magnetic field experienced by the NV ceters.