公开(公告)号：JPH0634732A

公开(公告)日：1994-02-10

申请号：JP8707193

申请日：1993-04-14

Applicant: IBM

Inventor： DANIERU RUGAA ,  JIYON AASAA SHIDORUSU ,  KOSUTANCHINO SHIERUDON YANNONI

IPC: G01N24/00 ,  G01N37/00 ,  G01Q60/52 ,  G01R33/038 ,  G01R33/20 ,  G01R33/28 ,  G01R33/46

Abstract: PURPOSE: To image a magnetic resonance effect with high resolution by modulating the magnetic moment of a material along the direction of polarization field at a frequency substantially lower than the resonance frequency of spin and oscillating an oscillator at a low frequency, thereby using a cantilever having a low resonance frequency. CONSTITUTION: A sample 20 is polarized in the Z-direction by means of an electromagnet 22 and a magnetic chip 24 on a cantilever 26. Field from the electromagnet 22 is controlled by means of a ramp signal generator 28 and a modulation signal generator 30. More specifically, the generator 28 sets the entire magnetization Mz at a specified level and the generator 30 periodically modulates a polarization field Hz. An RF signal generator 36 drives a high frequency coil 40 to excite a spin in the sample 20. High-frequency excitation of the spin is combined with the modulation of the polarization field Hz to cause periodic magnetization of the sample 20 in the direction Z of the polarization field. Ir is combined with the magnetic gradient of the chip 24 on the cantilever 26 to oscillate the cantilever 26. An oscillation signal is outputted from a line, 46 and the image of spin density of the sample 20 is obtained.