Real-space imaging of the atomic-scale magnetic structure of Fe1+yTe
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Spin-polarized scanning tunneling microscopy (SP-STM) has been used extensively to study magnetic properties of nanostructures. Using SP-STM to visualize magnetic order in strongly correlated materials on an atomic scale is highly desirable, but challenging. We achieved this goal in iron tellurium (Fe1+yTe), the nonsuperconducting parent compound of the iron chalcogenides, by using a STM tip with a magnetic cluster at its apex. Our images of the magnetic structure reveal that the magnetic order in the monoclinic phase is a unidirectional stripe order; in the orthorhombic phase at higher excess iron concentration (y > 0.12), a transition to a phase with coexisting magnetic orders in both directions is observed. It may be possible to generalize the technique to other high-temperature superconductor families, such as the cuprates.
Enayat , M , Sun , Z , Singh , U R , Aluru , R , Schmaus , S , Yaresko , A , Liu , Y , Lin , C , Tsurkan , V , Loidl , A , Deisenhofer , J & Wahl , P 2014 , ' Real-space imaging of the atomic-scale magnetic structure of Fe 1+ y Te ' , Science , vol. 345 , no. 6197 , pp. 653-656 . https://doi.org/10.1126/science.1251682
© 2014. This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on 31 July 2014, doi: 10.1126/science.1251682