Random Spin Signal in Magnetic Resonance Force Microscopy

TL;DR

This paper investigates the random magnetic resonance force microscopy signal caused by thermal vibrations, revealing a transition from regular to random signals with potential for spin detection through spectral signatures.

Contribution

It introduces the concept of a non-dissipative random MRFM signal caused by thermal vibrations and provides estimates for its characteristic times, highlighting its use in spin detection.

Findings

Identification of a random MRFM signal following the regular signal.

Estimation of characteristic decay times for regular and random signals.

Proposal that the random signal's spectral peak can be used for spin detection.

Abstract

We study a random magnetic resonance force microscopy (MRFM) signal caused by the thermal vibrations of high frequency cantilever modes in the oscillating cantilever-driven adiabatic reversals (OSCAR) technique. We show that the regular MRFM signal with a characteristic decay time, $\tau_m$, is followed by a non-dissipative random signal with a characteristic time $\tau_r$. We present the estimates for the values of $\tau_m$ and $\tau_r$. We argue that this random MRFM signal can be used for spin detection. It has a ``signature'' of a sharp peak in its Fourier spectrum.