The present letter describes a method to make a spin-polarized scanning tunneling microscopy tip by applying voltage pulses between a W tip and a magnetic sample. This spin-polarized tip has the similar characteristics as an Fe-coated W tip, which was confirmed by observations of antiferromagnetically coupled ferromagnetic Mn(001) layers (>3 ML) grown on an Fe(001) whisker at 370 K. Furthermore, we demonstrate that these voltage pulses can vary the tip magnetization direction.

1.
O.
Pietzsch
,
A.
Kubetzka
,
M.
Bode
, and
R.
Wiesendanger
,
Science
292
,
2053
(
2001
).
Google Scholar
Crossref
Search ADS
PubMed
 
2.
S. Heinze, Ph.D. thesis, University of Hamburg, 2000.
3.
T. K. Yamada, M. M. J. Bischoff, G. M. M. Heijnen, T. Mizoguchi, and H. van Kempen, Phys. Rev. Lett. (to be published).
4.
W.
Wulfhekel
,
H. F.
Ding
,
W.
Lutzke
,
G.
Steierl
,
M.
Vázquez
,
P.
Marı́n
,
A.
Hernando
, and
J.
Kirschner
,
Appl. Phys. A: Mater. Sci. Process.
72
,
463
(
2001
).
Google Scholar
Crossref
Search ADS
 
5.
R.
Jansen
,
M. W. J.
Prins
, and
H.
van Kempen
,
Phys. Rev. B
57
,
4033
(
1998
).
Google Scholar
Crossref
Search ADS
 
6.
R.
Jansen
,
R.
Schad
, and
H.
van Kempen
,
J. Magn. Magn. Mater.
198–199
,
668
(
1999
).
Google Scholar
 
7.
Y.
Suzuki
,
W.
Nabhan
,
R.
Shinohara
,
K.
Yamaguchi
, and
T.
Katayama
,
J. Magn. Magn. Mater.
198–199
,
540
(
1999
).
Google Scholar
 
8.
T. K.
Yamada
,
M. M. J.
Bischoff
,
T.
Mizoguchi
, and
H.
van Kempen
,
Surf. Sci.
516
,
179
(
2002
).
Google Scholar
Crossref
Search ADS
 
9.
U.
Staufer
,
L.
Scandella
,
H.
Rudin
,
H.-J.
Güntherodt
, and
N.
Garcia
,
J. Vac. Sci. Technol. B
9
,
1389
(
1991
).
Google Scholar
Crossref
Search ADS
 
10.
D. A.
Tulchinsky
,
D. T.
Pierce
,
A. D.
Davies
,
J. A.
Stroscio
,
J.
Unguris
, and
R. J.
Celotta
,
J. Magn. Magn. Mater.
212
,
91
(
2000
).
Google Scholar
Crossref
Search ADS
 
11.
S.
Andrieu
,
M.
Finazzi
,
Ph.
Bauer
,
H.
Fischer
,
P.
Lefevre
,
A.
Traverse
,
K.
Hricovini
,
G.
Krill
, and
M.
Piecuch
,
Phys. Rev. B
57
,
1985
(
1998
).
Google Scholar
Crossref
Search ADS
 
12.
T. G.
Walker
and
H.
Hopster
,
Phys. Rev. B
48
,
3563
(
1993
).
Google Scholar
Crossref
Search ADS
 
13.
M. M. J.
Bischoff
,
T.
Yamada
,
A. J.
Quinn
, and
H.
van Kempen
,
Surf. Sci.
501
,
155
(
2002
).
Google Scholar
Crossref
Search ADS
 
14.
Using the single step height of bcc–Fe(001) which is 0.143 nm, the apparent step heights of our STM measurements were calibrated.
15.
Different refers to tips prepared on different days.
16.
V. A.
Ukraintsev
,
Phys. Rev. B
53
,
11176
(
1996
).
Google Scholar
Crossref
Search ADS
 
17.
M. M. J. Bischoff, T. K. Yamada, C. M. Fang, R. A. de Groot, and H. van Kempen (unpublished).
18.
Using field emission spectroscopy we checked that a sharp tip with a tip radius of 20 nm became a blunter tip with a tip radius of 250 nm after applying many voltage pulses.
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© 2003 American Institute of Physics.
2003
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