The thermal stability of graded exchange spring media for perpendicular recording is investigated. It is found that the energy barrier linearly decreases with the external field strength. This leads to a high thermal stability in the low frequency recording limit, where large demagnetizing fields act on the media. The attempt frequency of graded media is about a factor of 5 larger than the attempt frequency of comparable single phase media.

1.
R. H.
Victora
and
X.
Shen
,
IEEE Trans. Magn.
41
,
2828
(
2005
).
2.
D.
Suess
,
T.
Schrefl
,
R.
Dittrich
,
M.
Kirschner
,
F.
Dorfbauer
,
G.
Hrkac
, and
J.
Fidler
,
J. Magn. Magn. Mater.
290-291
,
551
(
2005
).
3.
D.
Suess
,
Appl. Phys. Lett.
89
,
113105
(
2006
).
4.
J.
Miles
,
D.
McKirdy
,
R.
Chantrell
, and
R.
Wood
,
IEEE Trans. Magn.
39
,
1876
(
2003
).
5.
D.
Suess
,
J. Magn. Magn. Mater.
308
,
183
(
2007
).
6.
D.
Suess
,
V.
Tsiantos
,
T.
Schrefl
,
J.
Fidler
,
W.
Scholz
,
H.
Forster
,
R.
Dittrich
, and
J. J.
Miles
,
J. Magn. Magn. Mater.
248
,
298
(
2002
).
7.
R.
Dittrich
,
T.
Schrefl
,
D.
Suess
,
W.
Scholz
,
H.
Forster
, and
J.
Fidler
,
J. Magn. Magn. Mater.
250
,
12
(
2002
).
8.
R.
Skomski
,
J.
Zhou
,
R. D.
Kirby
, and
D. J.
Sellmyer
,
J. Appl. Phys.
99
,
08B906
(
2006
).
9.
E.
Della Torre
,
L. H.
Bennett
,
R. A.
Fry
, and
Ó. A.
Ducal
,
IEEE Trans. Magn.
38
,
3409
(
2002
).
10.
C. S.
Brown
,
J. W.
Harrell
, and
S.
Matsunuma
,
J. Appl. Phys.
100
,
053910
(
2006
).
11.
P.
Gaunt
,
IEEE Trans. Magn.
19
,
2030
(
1983
).
12.
D.
Suess
,
S.
Eder
,
J.
Lee
,
R.
Dittrich
,
J.
Fidler
,
J. W.
Harrell
,
T.
Schrefl
,
G.
Hrkac
,
M.
Schabes
,
N.
Supper
, and
A.
Berger
,
Phys. Rev. B
75
,
174430
(
2007
).
13.
J. W.
Harrell
,
IEEE Trans. Magn.
37
,
533
(
2001
).
14.
H. B.
Braun
,
J. Appl. Phys.
76
,
6310
(
1994
).
15.
M.
Kirschner
,
T.
Schrefl
,
F.
Dorfbauer
,
G.
Hrkac
,
D.
Suess
, and
J.
Fidler
,
J. Appl. Phys.
97
,
10E301
(
2005
).
16.
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