Electronic structure, electron field emission and magnetic behaviors of carbon nanotubes fabricated on La0.66Sr0.33MnO3 (LSMO) for spintronics application

Sekhar Chandra Ray; Huang-Ming Tsai; Huang-Chin Chen; Shang-Lun Wu; Dah-Chin Ling; I-Nan Lin; Way-Faung Pong

doi:10.1166/jnn.2011.4070

Electronic structure, electron field emission and magnetic behaviors of carbon nanotubes fabricated on La0.66Sr0.33MnO3 (LSMO) for spintronics application

J Nanosci Nanotechnol. 2011 Dec;11(12):10710-4. doi: 10.1166/jnn.2011.4070.

Authors

Sekhar Chandra Ray¹, Huang-Ming Tsai, Huang-Chin Chen, Shang-Lun Wu, Dah-Chin Ling, I-Nan Lin, Way-Faung Pong

Affiliation

¹ School of Physics, DST/NRF Centre of Excellence in Strong Materials and Materials Physics Research Institute (MPRI); University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa.

PMID: 22408979
DOI: 10.1166/jnn.2011.4070

Abstract

This work elucidates the electronic structure, electron field emission and magnetic anisotropic behaviors of single wall carbon nanotubes (SWCNTs) for the spin-electronics device application grown on the La0.66Sr0.33MnO3 (LSMO)/SrTiO3 (STO) substrate. Micro-Raman spectroscopy, X-ray absorption near-edge structure (XANES) and valence-band photoemission spectroscopy (VBPES) were used for the study of electronics structure. The field emission characteristics were studied from the electron field emission current density (J) versus applied electric field (E(A)) from which the turn-on electric field (E(TOE)) was evaluated. The magnetization behaviors are also presented by the M-H hysteresis loop and were obtained by applying the magnetic field in the parallel and perpendicular direction of the CNTs at 305 K and 5 K temperatures. A magnetic measurement shows that the coercivity of the CNTs/LSMO/STO is higher and has hig anisotropic-nature than the composite LSMO/STO that could be the good material for the future possible spin-electronics device applications.