We demonstrate controlled local phase switching of a VO2 film using a biased conducting atomic force microscope tip. After application of an initial, higher “training” voltage, the resistance transition is hysteretic with IV loops converging upon repeated voltage sweep. The threshold Vset to initiate the insulator-to-metal transition is on order 5V at room temperature, and increases at low temperature. We image large variations in Vset from grain to grain. Our imaging technique opens up the possibility for an understanding of the microscopic mechanism of phase transition in VO2 as well as its potential relevance to solid state devices.

1.
F. J.
Morin
,
Phys. Rev. Lett.
3
,
34
(
1959
).
2.
J.
Cao
,
E.
Ertekin
,
V.
Srinivasan
,
W.
Fan
,
S.
Huang
,
H.
Zheng
,
J. W. L.
Yim
,
D. R.
Khanal
,
D. F.
Ogletree
,
J. C.
Grossman
, and
J.
Wu
,
Nat. Nanotechnol.
4
,
732
(
2009
).
3.
G.
Stefanovich
,
A.
Pergament
, and
D.
Stefanovich
,
J. Phys.: Condens. Matter
12
,
8837
(
2000
).
4.
A.
Cavalleri
,
C.
Tóth
,
C.
Siders
,
J. A.
Squier
,
F.
Ráksi
,
P.
Forget
, and
J. C.
Kieffer
,
Phys. Rev. Lett.
87
,
237401
(
2001
).
5.
A.
Cavalleri
,
T.
Dekorsy
,
H. H. W.
Chong
,
J. C.
Kieffer
, and
R. W.
Schoenlein
,
Phys. Rev. B
70
,
161102
(
2004
).
6.
D.
Ruzmetov
,
K. T.
Zawilski
,
S. D.
Senanayake
,
V.
Narayanamurti
, and
S.
Ramanathan
,
J. Phys.: Condens. Matter
20
,
465204
(
2008
).
7.
C.
Chen
and
Z.
Zhou
,
Appl. Phys. Lett.
91
,
011107
(
2007
).
8.
T.
Driscoll
,
H. -T.
Kim
,
B. -G.
Chae
,
M. D.
Ventra
, and
D. N.
Basov
,
Appl. Phys. Lett.
95
,
043503
(
2009
).
9.
T.
Driscoll
,
S.
Palit
,
M. M.
Qazilbash
,
M.
Brehm
,
F.
Keilmann
,
B. -G.
Chae
,
S. -J.
Yun
,
H. -T.
Kim
,
S. Y.
Cho
,
N. M.
Jokerst
,
D. R.
Smith
, and
D. N.
Basov
,
Appl. Phys. Lett.
93
,
024101
(
2008
).
10.
M. -J.
Lee
,
Y.
Park
,
D. -S.
Suh
,
E. -H.
Lee
,
S.
Seo
,
D. -C.
Kim
,
R.
Jung
,
B. -S.
Kang
,
S. -E.
Ahn
,
C. B.
Lee
,
D. H.
Seo
,
Y. -K.
Cha
,
I. -K.
Yoo
,
J. -S.
Kim
, and
B. H.
Park
,
Adv. Mater.
19
,
3919
(
2007
).
11.
J. A. S.
Barker
,
H. W.
Verleur
, and
H. J.
Guggenheim
,
Phys. Rev. Lett.
17
,
1286
(
1966
).
12.
M. M.
Qazilbash
,
M.
Brehm
,
B. -G.
Chae
,
P. -C.
Ho
,
G. O.
Andreev
,
B. -J.
Kim
,
S. J.
Yun
,
A. V.
Balatsky
,
M. B.
Maple
,
F.
Keilmann
,
H. -T.
Kim
, and
D. N.
Basov
,
Science
318
,
1750
(
2007
).
13.
D.
Ruzmetov
,
K. T.
Zawilski
,
V.
Narayanamurti
, and
S.
Ramanathan
,
J. Appl. Phys.
102
,
113715
(
2007
).
14.
C.
Ko
and
S.
Ramanathan
,
J. Appl. Phys.
106
,
034101
(
2009
).
15.
D.
Ruzmetov
,
G.
Gopalakrishnan
,
J.
Deng
,
V.
Narayanamurti
, and
S.
Ramanathan
,
J. Appl. Phys.
106
,
083702
(
2009
).
16.
JCPDS Card No. 01–082–0661.
17.
Cantilever purchased from μmasch: http://www.spmtips.com/nsc/16/cr-au.
18.
L. A.
Ladd
and
W.
Paul
,
Solid State Commun.
7
,
425
(
1969
).
19.
Our attempts to use smaller forces with kc=0.15N/m and kc=3N/m spring constant cantilevers did not result in reproducible resistance measurements.
20.
C.
Ko
and
S.
Ramanathan
,
J. Appl. Phys.
104
,
086105
(
2008
).
21.
G.
Gopalakrishnan
,
D.
Ruzmetov
, and
S.
Ramanathan
,
J. Mater. Sci.
44
,
5345
(
2009
).
22.
M. M.
Qazilbash
,
Z. Q.
Li
,
V.
Podzorov
,
M.
Brehm
,
F.
Keilmann
,
B. G.
Chae
,
H. T.
Kim
, and
D. N.
Basov
,
Appl. Phys. Lett.
92
,
241906
(
2008
).
23.
S.
Kachi
,
K.
Kosuge
, and
H.
Okinaka
,
J. Solid State Chem.
6
,
258
(
1973
).
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