Study of electronic structure and magnetic anisotropy of rubrene/Ni Hetero-structures

RANGANADHA GOPALARAO TANGUTURI^1*, Jian-Chen Tsai¹, You-Siang Li¹, Jyh-Shen Tsay¹

¹physics, national taiwan normal university, taipei, Taiwan

* Presenter:RANGANADHA GOPALARAO TANGUTURI, email:ranganadh@ntnu.edu.tw

The results of structural, electronic and magnetic properties of an organic/inorganic hybrid bilayer of rubrene/Ni grown on Si substrate are discussed in this work. XRD patterns of bilayers showed that the Ni has poly-crystalline cubic structure with an insignificant evidence of crystalline behavior found in rubrene. XPS results confirmed that the electronic states of rubrene are highly polarized with C – C binding at the surface of Ni layer, whereas a Ni – C chemical interaction has been found at interface. Particularly, the highest occupied molecular orbital (HOMO) edge of rubrene shifted (~ 0.48 eV) towards Fermi level, which has been governed by the Ni – C interaction. Further, examination of magnetic hysteresis down to low temperatures, the effective magnetic anisotropy is estimated to be 3.31×10³ erg/cm³ at 25 K and 0.6×10³ erg/cm³ at 300 K.

Keywords: spinterface, mangetic properties, electronic structure