Measurement Of Extremely Feeblest Magnetic Information In Magnetic Exchange Force Microscopy Using Ferromagnetic Resonance

Electron spins is very important for investigating magnetic properties of nano-structuresurface at atomic scale. Magnetic Exchange Force Microscope (MExFM) which is asignificant method for measuring exchange force for electron spin has been introduced.However, the external magnetic field is necessary for the MExFM, which will damage thestructure of the sample surface; further, cross-talk between topography and spin informationbecomes serious for separating the two signals in MExFM measurement. These shortcomingswill limit the application of MExFM. In order to solve these, we developed a new method toseparate the topography and spin information using ferromagnetic resonance by microwaveradiating magnetic probe combined MExFM and non-contact atomic force microscopy(NC-AFM). We certificated that the topography and spin information can be completelyseparated using this method theoretically and experimentally. Primarily, the research toferromagnetic resonance effect is very critical. On the basis of theoretic research to theresonance effect, we observed the ferromagnetic resonance phenomenon successfully anddetermined the resonant frequency. The extremly feeblest magnetic information has beendetected. Also, the separation of topography and spin information has implementedpreliminarily. The study of ferromagnetic resonance effect is very important for developingthe FMR-MExFM, which is very useful for detecting the extremly feeblest magneticinformation and developing the spintronic devices and new-generation magnetic materials,etc.