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We demonstrate a versatile variable field module (VFM) with capability ofboth field and angular dependent measurements up to 1800 Oe for scanning probesystem. The magnetic field strength is changed by adjusting the distancebetween a rare earth magnet and the probe tip and is monitored in-situ by abuilt-in Hall sensor. Rotating the magnet allows the field vector to changefrom the horizontal to vertical direction and makes it possible to do angulardependent measurements. The capability of the VFM system is demonstrated bydegaussing a floppy disk media with increasing magnetic field. Angulardependent measurements clearly show the evolution of magnetic domainstructures, with a completely reversible magnetic force microscopy phasecontrast observed when the magnetic field is rotated by 180{\deg}. A furtherdemonstration of out-of-plane and in-plane magnetic switching of CoFe2O4pillars in CoFe2O4-BiFeO3 nanocomposites was presented and discussed.

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