Kavli Affiliate: Daniel C. Ralph
| First 5 Authors: Saba Karimeddiny, Thow Min Jerald Cham, Orion Smedley, Daniel C. Ralph, Yunqiu Kelly Luo
| Summary:
Sagnac interferometry can provide a significant improvement in
signal-to-noise ratio compared to conventional magnetic imaging based on the
magneto-optical Kerr effect (MOKE). We show that this improvement is sufficient
to allow quantitative measurements of current-induced magnetic deflections due
to spin-orbit torque even in thin-film magnetic samples with perpendicular
magnetic anisotropy for which the Kerr rotation is second-order in the magnetic
deflection. Sagnac interfermometry can also be applied beneficially for samples
with in-plane anisotropy, for which the Kerr rotation is first order in the
deflection angle. Optical measurements based on Sagnac interferometry can
therefore provide a cross-check on electrical techniques for measuring
spin-orbit torque. Different electrical techniques commonly give quantitatively
inconsistent results, so that Sagnac interferometry can help to identify which
techniques are affected by unidentified artifacts.
| Search Query: ArXiv Query: search_query=au:”Daniel C. Ralph”&id_list=&start=0&max_results=3