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Using the spin Hall effect of light, this work proposes a measurement technique of the magnetic properties of thin films. The beam shift of the spin Hall effect of light is used to replace the magneto-optical Kerr rotation angle as a parameter to characterize the magnetism of thin films. The technique can easily achieve an accuracy of 10−6 rad of the magneto-optical Kerr rotation angle which can, in theory, be further improved to 10−8 rad. We also proposed two methods to solve the problem of the exceeding linear response region of the measurement under high magnetic field intensity, making it more conducive to practical application. This technique has great potential for application in the magnetic measurement of ultra-thin films with particular emphasis on thicknesses within several atomic layers.

An unusual observation of magnetic transition and Pd/C rehybridization effects is reported in novel monolayer carbon foam materials filled with doubled FePd3 crystal lattices. We reveal the presence of not previously observed sharp Pd/C interfaces, as confirmed by X-ray photoelectron spectroscopy, which give rise to localized paramagnetic features in the ESR spectra for a g value of 2.05 at 130 K. Also, as revealed by vibrating sample magnetometry and electron spin resonance measurements, an increase in the magnetization values with the decrease of the temperature is found. This result is compatible with a structural rearrangement from a face centered cubic metastable paramagnetic FePd3 phase into a primitive ferromagnetic cubic Fe3Pd phase. Comparative studies performed in Fe3C/α-Fe filled thin walled carbon nanotubes also give further confirmations of these unusual types of transitions by revealing a bcc to fcc phase shift with the decrease of the temperature as confirmed by zero field cooled measurements of the magnetization and ESR. In addition, a temperature dependent variation in the intensity and position of the π-electron’s differential absorption feature is observed and implies the possible existence of antiferromagnetic correlations in the carbon-nanotubes structure.

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