MAGNETIC-RESONANCE FORCE MICROSCOPY WITH A FERROMAGNETIC TIP MOUNTED ON THE FORCE DETECTOR

The Magnetic Resonance Force Microscope (MRFM) presents the opportunit y for a magnetic resonance imaging probe with ultra-high, potentially atomic-scale, resolution. The successful application of this technique in detection of nuclear magnetic, electron-spin and ferromagnetic res onance (FMR) highlights its significant potential. We discuss the capa bilities of the MRFM with particular emphasis on the detection of FMR using MRFM techniques. A crucial remaining challenge in the developmen t of the magnetic resonance force microscope (MRFM) is to place the ma gnetic probe on the mechanical resonator. We address the problem of sp urious detector response arising from interactions between the magneti c tip and various external applied fields. We show that miniature, mag netically-polarized Nd2Fe14B particles show promise as magnetic probe tips. Our experience indicates it will be important to minimize the to tal polarized moment of the magnetic tip and to ensure that the applie d fields are as uniform as possible. (C) 1998 Elsevier Science B.V.