Regular and Random Magnetic Resonance Force Microscopy Signal with a Cantilever Oscillating Parallel to a Sample Surface

TL;DR

This paper provides a theoretical analysis of magnetic resonance force microscopy (MRFM) with a cantilever oscillating parallel to a sample surface, highlighting the transition from regular to random signals and their spectral features.

Contribution

It introduces a theoretical model for MRFM signals in OSCAR technique with parallel oscillation, emphasizing the spectral characteristics of the random signal phase.

Findings

Regular MRFM signal decays exponentially near the surface

Random signal component exhibits a characteristic spectral peak

Spectral analysis can distinguish regular and random MRFM signals

Abstract

We study theoretically the magnetic resonance force microscopy (MRFM) in oscillating cantilever-driven adiabatic reversals (OSCAR) technique, for the case when the cantilever tip oscillates parallel to the surface of a sample. The main contribution to the MRFM signal is associated with a part of the resonance slice near the surface of the sample. The regular (approximately exponential) decay of the MRFM signal is followed by the non-dissipating random signal. The Fourier spectrum of the random signal has a characteristic peak which can be used for the identification of the signal.