Orbital Hall magnetoresistance of epitaxially grown Fe/Cr bilayers

Abstract

During the last two decades, spin Hall effect has been intensively studied, because pure spin current can be generated in a non-ferromagnetic metal with strong spin orbit coupling, e.g., Pt, W or Ta. By the way, in recent few years, it has been demonstrated that orbital Hall effect occurs in light metal systems such as Cr. In this study, orbital dependent magnetoresistance, namely orbital Hall magnetoresistance (OMR), is observed in epitaxially grown Fe/Cr bilayers to see how the crystal texture can affect the orbital transport phenomena. The SMR signal showed similarity trend in both current direction I[100] and I[110] and the maximum value SMR ~ 0.7 is comparable with other systems with the same characteristics. We also propose a reliable method to fit the SMR signal when the external magnetic field is under saturate field of sample, the advantage and disadvantage of this method will also be discussed.