Observation of Ultra-low AC Susceptibility in Micro-magnets Using Quantum Diamond Microscope
arxiv(2024)
摘要
AC susceptometry, unlike static susceptometry, offers a deeper insight into
magnetic materials. By employing AC susceptibility measurements, one can glean
into crucial details regarding magnetic dynamics. Nevertheless, traditional AC
susceptometers are constrained to measuring changes in magnetic moments within
the range of a few nano-joules per tesla. Additionally, their spatial
resolution is severely limited, confining their application to bulk samples
only. In this study, we introduce the utilization of a Nitrogen Vacancy (NV)
center-based quantum diamond microscope for mapping the AC susceptibility of
micron-scale ferromagnetic specimens. By employing coherent pulse sequences, we
extract both magnitude and the phase of the field from samples within a field
of view spanning 70 micro-meters while achieving a resolution of 1 micro-meter.
Furthermore, we quantify changes in dipole moment on the order of a
femto-joules per tesla induced by excitations at frequencies reaching several
hundred kilohertz.
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