We report on magnetic field and temperature-dependent measurements of the anisotropic magnetoresistance (AMR) in epitaxial (LSMO) thin films. While in ferromagnetic alloys increasing the magnetization, either by reducing the temperature or increasing the magnetic field, increases the AMR, we find that in LSMO films the AMR dependence on magnetization displays nonmonotonic behavior which becomes particularly pronounced in lightly doped compounds. We believe that this behavior is related to the inhomogeneity exhibited by these materials.
REFERENCES
1.
S.
Jin
, T. H.
Tiefel
, M.
McCormack
, R. A.
Fastnacht
, R.
Ramesh
, and L. H.
Chen
, Science
264
, 413
(1994
).2.
Colossal Magnetoresistive Oxides
, edited by Y.
Tokura
(Gordon and Breach
, Amsterdam, The Netherlands
, 2000
);J. Z.
Sun
and A.
Gupta
, Annu. Rev. Mater. Sci.
28
, 45
(1998
).3.
4.
Magnetism II - Materials and Applications
, edited by É.
du Trémolet
de Lacheisserie
, D.
Gignoux
, and M.
Schlenker
(Kluwer
, Norwell, MA
, 2002
).5.
Y.
Bason
, L.
Klein
, J. -B.
Yau
, X.
Hong
, and C. H.
Ahn
, Appl. Phys. Lett.
84
, 2593
(2004
).6.
Y.
Bason
, L.
Klein
, J. -B.
Yau
, X.
Hong
, J.
Hoffman
, and C. H.
Ahn
, J. Appl. Phys.
99
, 08R701
(2006
).7.
E. D.
Dahlberg
, R.
Riggs
, and G. A.
Printz
, J. Appl. Phys.
63
, 4270
(1988
).8.
Th. G. S. M.
Rijks
, R.
Coehoorn
, and M. J. M.
de Jong
, Phys. Rev. B
51
, 283
(1995
).9.
O.
Jaoul
, I. A.
Campbell
, and A.
Fert
, J. Magn. Magn. Mater.
5
, 23
(1977
);A. P.
Malozemoff
, Phys. Rev. B
32
, 6080
(1985
).10.
11.
A.
Fert
and I. A.
Campbell
, Phys. Rev. Lett.
21
, 1190
(1968
).12.
I. A.
Campbell
, Phys. Rev. Lett.
24
, 269
(1970
).13.
O.
Jaoul
, I. A.
Campbell
, and A.
Fert
, J. Magn. Magn. Mater.
5
, 23
(1977
).14.
P. A.
Stampe
, X.
Chen
, Z.
Wang
, H. P.
Kunkel
, and G.
Williams
, J. Phys.: Condens. Matter
6
, 3045
(1994
).15.
P. A.
Stampe
, H. P.
Kunkel
, Z.
Wang
, and G.
Williams
, Phys. Rev. B
52
, 335
(1995
).16.
J. N.
Eckstein
, I.
Bozovic
, J.
O’Donnell
, M.
Onellion
, and M. S.
Rzchowski
, Appl. Phys. Lett.
69
, 1312
(1996
).17.
H. S.
Wang
, Q.
Li
, K.
Liu
, and C. L.
Chien
, Appl. Phys. Lett.
74
, 2212
(1999
).18.
J.
O’Donnell
, M. J. N.
Eckstein
, and M. S.
Rzchowski
, Appl. Phys. Lett.
76
, 218
(2000
).19.
Q.
Li
, H. S.
Wang
, Y. F.
Hu
, and E.
Wertz
, J. Appl. Phys.
87
, 5573
(2000
).20.
M.
Ziese
and S. P.
Sena
, J. Phys.: Condens. Matter
10
, 2727
(1998
);M.
Ziese
, Phys. Rev. B
62
, 1044
(2000
).21.
B. I.
Belevtsev
, V. B.
Krasovitsky
, D. G.
Naugle
, K. D. D.
Rathnayaka
, A.
Parasiris
, S. R.
Surthi
, R. K.
Pandey
, and M. A.
Rom
, Phys. Status Solidi A
188
, 1187
(2001
).22.
M.
Bibes
, V.
Laukhin
, S.
Valencia
, B.
Martínez
, J.
Foncuberta
, O.
Yu Gorbenko
, A. R.
Kaul
, and J. L.
Martínez
, J. Phys.: Condens. Matter
17
, 2733
(2005
).23.
At sufficiently high magnetic fields, the magnetization is aligned with the field orientation, making .
24.
M.
Bibes
, B.
Martínez
, J.
Foncuberta
, V.
Trtik
, C.
Ferrater
, and F.
Sánchez
, J. Magn. Magn. Mater.
211
, 206
(2000
).25.
A constant resistivity is subtracted from each as-measured trace to obtain the amplitude of .
26.
27.
T. R.
McGuire
and R. I.
Potter
, IEEE Trans. Magn.
11
, 1018
(1975
).28.
X. W.
Li
, A.
Gupta
, G.
Xiao
, and G. Q.
Gong
, Appl. Phys. Lett.
71
, 1124
(1997
).29.
A.
Gupta
, G. Q.
Gong
, G.
Xiao
, P. R.
Duncombe
, P.
Lecoeur
, P.
Trouillod
, Y. Y.
Wang
, V. P.
Dravid
, and J. Z.
Sun
, Phys. Rev. B
54
, R15629
(1996
).30.
A.
Biswas
, M.
Rajeswari
, R. C.
Srivastava
, T.
Venkatesan
, R. L.
Greene
, and A. J.
Millis
, Phys. Rev. B
61
, 9665
(2000
);A.
Biswas
, M.
Rajeswari
, R. C.
Srivastava
, T.
Venkatesan
, R. L.
Greene
, Q.
Liu
, A. L.
de Lozanne
, and A. J.
Millis
, Phys. Rev. B
63
, 184424
(2001
).31.
N.
Farag
, M.
Bobeth
, W.
Pompe
, A. E.
Romanov
, and J. S.
Speck
, J. Appl. Phys.
97
, 113516
(2005
).32.
A.
Khapikov
, L.
Uspenskaya
, I.
Bdikin
, Ya.
Mukovskii
, S.
Karabashev
, D.
Shulyaev
, and A.
Arsenov
, Appl. Phys. Lett.
77
, 2376
(2000
).33.
J. -L.
Maurice
, F.
Pailloux
, A.
Barthélémy
, O.
Durnad
, D.
Imhoff
, R.
Lyonnet
, A.
Rocher
, and J. -P.
Contour
, Philos. Mag.
83
, 3201
(2003
).34.
Y.
Tokura
, A.
Urushibara
, Y.
Moritomo
, T.
Arima
, A.
Asamitsu
, G.
Kido
, and N.
Furukawa
, J. Phys. Soc. Jpn.
63
, 3931
(1994
);A.
Urushibara
, Y.
Moritomo
, T.
Arima
, A.
Asamitsu
, G.
Kido
, and Y.
Tokura
, Phys. Rev. B
51
, 14103
(1995
).35.
Another difference between the uniform and nonuniform states could be in the local current direction. While in the uniform state the local and average current directions are the same, in the nonuniform state the local current direction may vary. Further study is required to investigate this effect.
36.
M.
Fäth
, S.
Freisem
, A. A.
Menovsky
, Y.
Tomioka
, J.
Aarts
, and J. A.
Mydosh
, Science
285
, 1540
(1999
).37.
A.
Urushibara
, Y.
Moritomo
, T.
Arima
, A.
Asamitsu
, G.
Kido
, and Y.
Tokura
, Phys. Rev. B
51
, 14103
(1995
);K.
Kubo
and N.
Ohata
, J. Phys. Soc. Jpn.
33
, 21
(1972
);N.
Furukawa
, J. Phys. Soc. Jpn.
63
, 3214
(1994
).38.
X.
Hong
, J. -B.
Yau
, J. D.
Hoffman
, C. H.
Ahn
, Y.
Bason
, and L.
Klein
, Phys. Rev. B
74
, 174406
(2006
).39.
Note that in manganite thin films with different doping levels the electronic inhomogeneities may affect the local current directions, namely the angle between the local magnetization and the current, which is worth further investigation.
© 2007 American Institute of Physics.
2007
American Institute of Physics
You do not currently have access to this content.
