High magnetic field-induced synthesis of one-dimensional FePt nanomaterials

摘要

6 Tesla high magnetic field has been employed to synthesize FePt nanomaterials. The results show that the applied high magnetic field can facilitate one-dimensional anisotropic growth of FePt nanomaterials. The mechanism of high magnetic field-induced anisotropic growth has been discussed. With the effect of high magnetic field, FePt nanomaterials would be magnetized and their easy magnetization axis would be parallel to the field direction. The magnetized nanoparticles with same orientation easily attach to form a one-dimensional nanostructure by magnetic dipolar interactions. Moreover, the magnetized nanomaterials preferred anisotropic growth with higher aspect ratio to lower the demagnetization energy.