Abstract
We report on the growth of FePt nanostructures by self-assembling on the van der Waals surface ofWSe2(0001) under ultra-high vacuum conditions. The morphology and crystalline structureof nanostructures were investigated by reflection high energy electrondiffraction (RHEED), scanning tunnelling microscopy (STM) and x-ray diffraction.The FePt nanostructures grow with the (111) plane azimuthally aligned to theWSe2(0001) plane with a narrow size distribution centred around 4.5 nmshowing a rounded shape for deposition temperatures in the300–500 °C range. Theydevelop the L10-type structure starting at a relatively low deposition temperature of about200 °C with the occurrence of three possible variants. Moreover, segregation ofSe at the growing surface was observed even in films deposited at roomtemperature. However, such a surfactant effect does not prevent theL10 ordering and could explain the perpendicular magnetic anisotropy observed in previously studiedCoPt3 films grown at roomtemperature on WSe2. Magnetic measurements in 3 nm thick FePt(111) deposits have revealed an easyaxis of magnetization in the film plane, with a coercivity strongly enhanced withL10 order.
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