A versatile variable field module for field and angular dependent scanning probe microscopy measurements

TL;DR

This paper introduces a versatile variable field module for scanning probe microscopy that enables magnetic field and angular dependent measurements up to 1800 Oe, with in-situ control and reversible magnetic domain imaging.

Contribution

A novel variable field module allowing in-situ magnetic field adjustment and angular control for enhanced scanning probe microscopy measurements.

Findings

Demonstrated magnetic domain evolution during degaussing of floppy disk media.

Reversible magnetic contrast observed with 180° field rotation.

Achieved magnetic switching in nanostructured CoFe2O4 pillars.

Abstract

We demonstrate a versatile variable field module (VFM) with capability of both field and angular dependent measurements up to 1800 Oe for scanning probe system. The magnetic field strength is changed by adjusting the distance between a rare earth magnet and the probe tip and is monitored in-situ by a built-in Hall sensor. Rotating the magnet allows the field vector to change from the horizontal to vertical direction and makes it possible to do angular dependent measurements. The capability of the VFM system is demonstrated by degaussing a floppy disk media with increasing magnetic field. Angular dependent measurements clearly show the evolution of magnetic domain structures, with a completely reversible magnetic force microscopy phase contrast observed when the magnetic field is rotated by 180{\deg}. A further demonstration of out-of-plane and in-plane magnetic switching of CoFe2O4 pillars in CoFe2O4-BiFeO3 nanocomposites was presented and discussed.