Probing complex oxide interfaces with scanning SQUID microscopy


  Shai Wissberg[1,2]  ,  Eylon Persky[1,2]  ,  Yiftach Frenkel[1,2]  ,  Anna Kremen[1,2]  ,  Noam Hacham[1,2]  ,  Yishai Shperber[1,2]  ,  Beena Kalisky[1,2]  
[1] Physics Department, Bar Ilan University
[2] Institute for Nanotechnologies and Advanced Materials, Bar Ilan University

Local view of electronic properties at complex oxide interfaces can improve our understanding of the physics at the interface. In our poster we show how we use superconducting quantum interference device (SQUID) to image magnetic flux over the interface. SQUID excels in sensitivity, non-invasiveness and can see slightly below the surface, which resolves one of the challenges in probing the interface, buried several atomic layers below the surface. With scanning SQUID we map the ferromagnetic landscape, detect paramagnetic response from localized spins or even small traces of superconductivity, and map the flow of current at the interface. Most importantly, we can image these simultaneously, enabling study of the correlation between the various electronic states that emerge at the interface.