We have fabricated ultrathin Co particles with various shapes, variable thicknesses δ (2 ML<δ<22 ML), and lateral size L ranging from 100 μm to ≈100 nm. We find that all particles are magnetized in-plane at room temperature and are in a single domain state, independently of shape and size—with some remarkable exceptions. We also find that the magnetic state of a particle can be manipulated without influencing the state of the neighbors.
REFERENCES
1.
2.
R. Q.
Wu
, L. J.
Chen
, A.
Shick
, and A. J.
Freeman
, J. Magn. Magn. Mater.
177-181
, 1216
(1998
).3.
P.
Krams
, F.
Lauks
, R. L.
Stamps
, B.
Hillebrands
, and G.
Güntherodt
, Phys. Rev. Lett.
69
, 3674
(1992
);P.
Krams
, F.
Lauks
, R. L.
Stamps
, B.
Hillebrands
, G.
Güntherodt
, and H. P.
Oepen
, J. Magn. Magn. Mater.
121
, 483
(1993
).4.
5.
6.
E.
Gu
, E.
Ahmad
, S. J.
Gray
, C.
Daboo
, J. A. C.
Bland
, and L. M.
Brown
, Phys. Rev. Lett.
78
, 1158
(1997
).7.
8.
A.
Vaterlaus
, U.
Maier
, U.
Ramsperger
, and A.
Hensch
, Rev. Sci. Instrum.
68
, 2800
(1997
).9.
10.
K.
Koike
, H.
Matsuyama
, and K.
Hayakawa
, Scanning Microsc.
Suppl. 1
, 241
(1987
).11.
12.
13.
Ch.
Stamm
, F.
Marty
, A.
Vaterlaus
, V.
Weich
, S.
Egger
, U.
Maier
, U.
Ramsperger
, H.
Fuhrmann
, and D.
Pescia
, Science
282
, 449
(1998
).14.
W.
Weber
, C. H.
Back
, A.
Bischof
, D.
Pescia
, and R.
Allenspach
, Nature (London)
374
, 788
(1995
).15.
M.
Hehn
, K.
Ounadjela
, J. P.
Bucher
, F.
Rousseaux
, D.
Decanini
, B.
Bartenlian
, and C.
Chappert
, Science
272
, 1782
(1996
).16.
U.
Ebels
, A. O.
Adeyeye
, M.
Gester
, C.
Daboo
, R. P.
Cowburn
, and J. A. C.
Bland
, J. Appl. Phys.
81
, 4724
(1997
).17.
C.
Beeli
, B.
Doudin
, J.-Ph.
Ansermet
, and P. A.
Stadelmann
, Ultramicroscopy
67
, 143
(1997
).18.
M. S.
Wei
and S. Y.
Chou
, J. Appl. Phys.
177-181
, 1216
(1998
) and the references therein.19.
D. D.
Awschalom
and D. P.
DiVincenzo
, Phys. Today
48
, 43
(1995
) and references therein.20.
A. D.
Kent
, S.
von Molnar
, S.
Gider
, and D. D.
Awschalom
, J. Appl. Phys.
76
, 6656
(1994
).21.
J. F.
Smyth
, S.
Schultz
, D. R.
Fredkin
, D. P.
Kern
, S. A.
Rishton
, H.
Schmid
, M.
Cali
, and T. R.
Koehler
, J. Appl. Phys.
69
, 5262
(1991
).22.
R. M. H.
New
, R. F. W.
Pease
, and R. L.
White
, J. Vac. Sci. Technol. B
13
, 1089
(1995
).23.
W.
Wernsdorfer
, B.
Doudin
, D.
Mailly
, K.
Hasselbach
, A.
Benoit
, J.
Meier
, J. P.
Ansermet
, and B.
Barbara
, Phys. Rev. Lett.
77
, 1873
(1996
).24.
F.
Rousseaux
, D.
Decanini
, F.
Carcenac
, E.
Cambril
, M. F.
Ravet
, C.
Chappert
, N.
Bardou
, B.
Bartenlian
, and P.
Veillet
, J. Vac. Sci. Technol. B
13
, 2787
(1995
).
This content is only available via PDF.
© 1999 American Institute of Physics.
1999
American Institute of Physics
You do not currently have access to this content.
