We have studied the electronic and magnetic properties of the interface between molecules and a Fe(001) surface. X-ray absorption spectroscopy and x-ray magnetic circular dichroism studies of monolayers on Fe(001) surfaces show that hybridization between the frontier orbitals of and continuum states of Fe leads to a significant magnetic polarization of -derived orbitals. The magnitude and also the sign of this polarization were found to depend markedly on the excitation energy. These observations underline the importance of tailoring the interfacial spin polarization at the Fermi level of ferromagnet/organic semiconductor interfaces for applications in organic spintronics.
REFERENCES
1.
W. J. M.
Naber
, S.
Faez
, and W. G.
van der Wiel
, J. Phys. D
40
, R205
(2007
);V.
Dediu
, L. E.
Hueso
, I.
Bergenti
, and C.
Taliani
, Nature Mater.
8
, 707
(2009
);S.
Sanvito
, Nature Mater.
6
, 803
(2007
).2.
C. B.
Harris
, R. L.
Schlupp
, and H.
Schuch
, Phys. Rev. Lett.
30
, 1019
(1973
);V. I.
Krinichnyi
, S. D.
Chemerisov
, and Y. S.
Lebedev
, Phys. Rev. B
55
, 16233
(1997
).3.
N.
Tombros
, C.
Jozsa
, M.
Popinciuc
, H. T.
Jonkman
, and B. J.
van Wees
, Nature (London)
448
, 571
(2007
).4.
L. E.
Hueso
, J. M.
Pruneda
, V.
Ferrari
, G.
Burnell
, J. P.
Valdés-Herrera
, B. D.
Simons
, P. B.
Littlewood
, E.
Artacho
, A.
Fert
, and N. D.
Mathur
, Nature (London)
445
, 410
(2007
).5.
T. S.
Santos
, J. S.
Lee
, P.
Migdal
, I. C.
Lekshmi
, B.
Satpati
, and J. S.
Moodera
, Phys. Rev. Lett.
98
, 016601
(2007
).6.
C.
Barraud
, P.
Seneor
, R.
Mattana
, S.
Fusil
, K.
Bouzehouane
, C.
Deranlot
, P.
Graziosi
, L.
Hueso
, I.
Bergenti
, V.
Dediu
, F.
Petroff
, and A.
Fert
, Nat. Phys.
6
, 615
(2010
).7.
Z. H.
Xiong
, D.
Wu
, Z. V.
Vardeny
, and J.
Shi
, Nature (London)
427
, 821
(2004
).8.
V.
Dediu
, L. E.
Hueso
, I.
Bergenti
, A.
Riminucci
, F.
Borgatti
, P.
Graziosi
, C.
Newby
, F.
Casoli
, M. P.
de Jong
, C.
Taliani
, and Y.
Zhan
, Phys. Rev. B
78
, 115203
(2008
).9.
T.
Shimada
, H.
Nogawa
, T.
Noguchi
, Y.
Furubayashi
, Y.
Yamamoto
, Y.
Hirose
, T.
Hitosugi
, and T.
Hasegawa
, Jpn. J. Appl. Phys.
47
, 1184
(2008
).10.
J. H.
Shim
, K. V.
Raman
, Y. J.
Park
, T. S.
Santos
, G. X.
Miao
, B.
Satpati
, and J. S.
Moodera
, Phys. Rev. Lett.
100
, 226603
(2008
).11.
L.
Schulz
, L.
Nuccio
, M.
Willis
, P.
Desai
, P.
Shakya
, T.
Kreouzis
, V. K.
Malik
, C.
Bernhard
, F. L.
Pratt
, N. A.
Morley
, A.
Suter
, G. J.
Nieuwenhuys
, T.
Prokscha
, E.
Morenzoni
, W. P.
Gillin
, and A. J.
Drew
, Nature Mater.
10
, 39
(2011
).12.
T. D.
Nguyen
, G.
Hukic-Markosian
, F.
Wang
, L.
Wojcik
, X. -G.
Li
, E.
Ehrenfreund
, and Z. V.
Vardeny
, Nature Mater.
9
, 345
(2010
).13.
B.
Wassermann
, Philos. Mag.
83
, 1929
(2003
);C.
Martinez-Boubeta
, J. L.
Costa-Kramer
, and A.
Cebollada
, J. Phys.: Condens. Matter
15
, R1123
(2003
).14.
T.
Urano
and T.
Kanaji
, J. Phys. Soc. Jpn.
57
, 3403
(1988
).15.
A. J.
Maxwell
, P. A.
Brühwiler
, D.
Arvanitis
, J.
Hasselström
, M. K.-J.
Johansson
, and N.
Mårtensson
, Phys. Rev. B
57
, 7312
(1998
).16.
B.
Wästberg
, S.
Lunell
, C.
Enkvist
, P. A.
Brühwiler
, A. J.
Maxwell
, and N.
Mårtensson
, Phys. Rev. B
50
, 13031
(1994
).17.
K. -D.
Tsuei
, J. -Y.
Yuh
, C. -T.
Tzeng
, R. -Y.
Chu
, S. -C.
Chung
, and K. -L.
Tsang
, Phys. Rev. B
56
, 15412
(1997
).18.
D.
Liu
, Y.
Hu
, H.
Guo
, and X. F.
Han
, Phys. Rev. B
78
, 193307
(2008
);S.
Javaid
, M.
Bowen
, S.
Boukari
, L.
Joly
, J. -B.
Beaufrand
, X.
Chen
, Y. J.
Dappe
, F.
Scheurer
, J. -P.
Kappler
, J.
Arabski
, W.
Wulfhekel
, M.
Alouani
, and E.
Beaurepaire
, Phys. Rev. Lett.
105
, 077201
(2010
);
[PubMed]
Y. Q.
Zhan
, E.
Holmström
, R.
Lizárraga
, O.
Eriksson
, X. J.
Liu
, F. H.
Li
, E.
Carlegrim
, S.
Stafström
, and M.
Fahlman
, Adv. Mater. (Weinheim, Ger.)
22
, 1626
(2010
).19.
N.
Atodiresei
, J.
Brede
, P.
Lazic
, V.
Caciuc
, G.
Hoffmann
, R.
Wiesendanger
, and S.
Blügel
, Phys. Rev. Lett.
105
, 066601
(2010
).20.
M.
Weser
, Y.
Rehder
, K.
Horn
, M.
Sicot
, M.
Fonin
, and A. B.
Preobrajenski
, Appl. Phys. Lett.
96
, 012504
(2010
).21.
G.
Bertoni
, L.
Calmels
, A.
Altibelli
, and V.
Serin
, Phys. Rev. B
71
, 075402
(2005
).22.
X.
Sun
, A.
Pratt
, and Y.
Yamauchi
, J. Phys. D: Appl. Phys.
43
, 385002
(2010
).23.
M.
Takahashi
and J. -I.
Igarashi
, Phys. Rev. B
67
, 245104
(2003
).24.
C. T.
Chen
, Y. U.
Idzerda
, H. -J.
Lin
, N. V.
Smith
, G.
Meigs
, E.
Chaban
, G. H.
Ho
, E.
Pellegrin
, and F.
Sette
, Phys. Rev. Lett.
75
, 152
(1995
).© 2011 American Institute of Physics.
2011
American Institute of Physics
You do not currently have access to this content.