We study perpendicularly magnetized Ta/CoFeB/MgO films and investigate whether their irradiation with light ions can improve their properties by inducing a different crystallization dynamics. We report the magnetization, anisotropy, g-factor, and damping dependence upon irradiation fluence and discuss their evolutions with collisional mixing simulations and its expected consequence on magnetic properties. We show that after a short irradiation at 100 °C, the anisotropy increases close to the value obtained by conventional high temperature annealing. Higher irradiation-induced increase of anisotropy can be obtained but with a detrimental effect on the damping that can be understood from spin-orbit contributions.

1.
S.
Ikeda
,
K.
Miura
,
H.
Yamamoto
,
K.
Mizunuma
,
H. D.
Gan
,
M.
Endo
,
S.
Kanai
,
J.
Hayakawa
,
F.
Matsukura
, and
H.
Ohno
,
Nat. Mater.
9
,
721
(
2010
).
2.
T.
Devolder
,
P.-H.
Ducrot
,
J.-P.
Adam
,
I.
Barisic
,
N.
Vernier
,
J.-V.
Kim
,
B.
Ockert
, and
D.
Ravelosona
,
Appl. Phys. Lett.
102
,
022407
(
2013
).
3.
A. V.
Khvalkovskiy
,
D.
Apalkov
,
S.
Watts
,
R.
Chepulskii
,
R. S.
Beach
,
A.
Ong
,
X.
Tang
,
A.
Driskill-Smith
,
W. H.
Butler
,
P. B.
Visscher
,
D.
Lottis
,
E.
Chen
,
V.
Nikitin
, and
M.
Krounbi
,
J. Phys. D: Appl. Phys.
46
,
074001
(
2013
).
4.
A. T. G.
Pym
,
A.
Lamperti
,
B. K.
Tanner
,
T.
Dimopoulos
,
M.
Rührig
, and
J.
Wecker
,
Appl. Phys. Lett.
88
,
162505
(
2006
).
5.
Y. M.
Lee
,
J.
Hayakawa
,
S.
Ikeda
,
F.
Matsukura
, and
H.
Ohno
,
Appl. Phys. Lett.
90
,
212507
(
2007
).
6.
S.
Isogami
,
M.
Tsunoda
,
K.
Komagaki
,
K.
Sunaga
,
Y.
Uehara
,
M.
Sato
,
T.
Miyajima
, and
M.
Takahashi
,
Appl. Phys. Lett.
93
,
192109
(
2008
).
7.
S.
Monso
,
B.
Rodmacq
,
S.
Auffret
,
G.
Casali
,
F.
Fettar
,
B.
Gilles
,
B.
Dieny
, and
P.
Boyer
,
Appl. Phys. Lett.
80
,
4157
(
2002
).
8.
W.-G.
Wang
,
S.
Hageman
,
M.
Li
,
S.
Huang
,
X.
Kou
,
X.
Fan
,
J. Q.
Xiao
, and
C. L.
Chien
,
Appl. Phys. Lett.
99
,
102502
(
2011
).
9.
N.
Ding
,
T.
Wang
,
K.
Tai
,
J.
Li
,
X.
He
,
Y.
Dai
, and
B.
Liu
,
J. Alloys Compd.
476
,
253
(
2009
).
10.
R. H.
Davies
,
A. T.
Dinsdale
,
J. A.
Gisby
,
J. A. J.
Robinson
, and
S. M.
Martin
,
CALPHAD
26
(
2
),
229
(
2002
).
11.
A.
Lamperti
,
S.-M.
Ahn
,
B.
Ocker
,
R.
Mantovan
, and
D.
Ravelosona
,
Thin Solid Films
533
,
79
(
2013
).
12.
A. A.
Greer
,
A. X.
Gray
,
S.
Kanai
,
A. M.
Kaiser
,
S.
Ueda
,
Y.
Yamashita
,
C.
Bordel
,
G.
Palsson
,
N.
Maejima
,
S.-H.
Yang
,
G.
Conti
,
K.
Kobayashi
,
S.
Ikeda
,
F.
Matsukura
,
H.
Ohno
,
C. M.
Schneider
,
J. B.
Kortright
,
F.
Hellman
, and
C. S.
Fadley
,
Appl. Phys. Lett.
101
,
202402
(
2012
).
13.
S. V.
Karthik
,
Y. K.
Takahashi
,
T.
Ohkubo
,
K.
Hono
,
S.
Ikeda
, and
H.
Ohno
,
J. Appl. Phys.
106
,
023920
(
2009
).
14.
K.
Komagaki
,
M.
Hattori
,
K.
Noma
,
H.
Kanai
,
K.
Kobayashi
,
Y.
Uehara
,
M.
Tsunoda
, and
M.
Takahashi
,
IEEE Trans. Magn.
45
,
3453
(
2009
).
15.
T.
Devolder
and
H.
Bernas
, in
Magnetic Properties and Ion Beams: Why and How
, edited by
H.
Bernas
(
Springer
,
2010
), p.
116
.
16.
J.
Fassbender
,
D.
Ravelosona
, and
Y.
Samson
,
J. Phys. D: Appl. Phys.
37
,
R179
(
2004
).
17.
D.
Ravelosona
,
C.
Chappert
,
V.
Mathet
, and
H.
Bernas
,
Appl. Phys. Lett.
76
,
236
(
2000
).
18.
H.
Bernas
,
J.-P.
Attané
,
K.-H.
Heinig
,
D.
Halley
,
D.
Ravelosona
,
A.
Marty
,
P.
Auric
,
C.
Chappert
, and
Y.
Samson
,
Phys. Rev. Lett.
91
,
077203
(
2003
).
19.
T.
Devolder
,
Phys. Rev. B
62
,
5794
(
2000
).
20.
A.
Traverse
,
M. G. L.
Boite
, and
G.
Martin
,
Europhys. Lett.
8
,
633
(
1989
).
21.
C.
Bilzer
,
T.
Devolder
,
J.-V.
Kim
,
G.
Counil
,
C.
Chappert
,
S.
Cardoso
, and
P. P.
Freitas
,
J. Appl. Phys.
100
,
053903
(
2006
).
22.
C.
Bilzer
,
T.
Devolder
,
P.
Crozat
, and
C.
Chappert
,
IEEE Trans. Magn.
44
,
3265
(
2008
).
23.
Y. S.
Chen
,
C.-W.
Cheng
,
G.
Chern
,
W. F.
Wu
, and
J. G.
Lin
,
J. Appl. Phys.
111
,
07C101
(
2012
).
24.
X.
Liu
,
W.
Zhang
,
M. J.
Carter
, and
G.
Xiao
,
J. Appl. Phys.
110
,
033910
(
2011
).
25.
L.
Varga
and
W. D.
Doyle
,
J. Appl. Phys.
79
,
4995
(
1996
).
26.
C. L.
Chien
,
S. H.
Liou
,
B. K.
Ha
, and
K. M.
Unruh
,
J. Appl. Phys.
57
,
3539
(
1985
).
27.
J. O.
Rantschler
,
R. D.
McMichael
,
A.
Castillo
,
A. J.
Shapiro
,
J. W. F.
Egelhoff
,
B. B.
Maranville
,
D.
Pulugurtha
,
A. P.
Chen
, and
L. M.
Connors
,
J. Appl. Phys.
101
,
033911
(
2007
).
28.
A. R.
Mackintosh
and
O. K.
Andersen
,
Electrons at the Fermi Surface
, edited by
M.
Springford
(
Cambridge University Press
,
2011
).
29.
G. G.
Scott
and
H. W.
Sturner
,
Phys. Rev.
184
,
490
(
1969
).
30.
L.
Lindhard
,
M.
Sharff
, and
H.
Schiott
, “
Det Kongelige Danske Videnskabernes Selskab
,”
Mat. Fys. Medd. Vidensk. Selsk.
33
,
14
(
1963
).
31.
A.
Audouard
,
J.
Balogh
,
J.
Dural
, and
J. C.
Jousset
,
Radiat. Eff.
62
,
161
(
1982
).
32.
S.
Zinkle
and
C.
Kinoshita
, in
Proceedings of the International Workshop on Defect Production, Accumulation and Materials Performance in an Irradiation Environment, Davos, Switzerland, 2–8 October 1996
[J. Nucl. Mater.
251
,
200
(
1997
)].
33.
J. F.
Ziegler
,
J. P.
Biersack
, and
M. D.
Ziegler
,
SRIM, The Stopping and Range of Ions in Matter
(
SRIM Co.
,
2008
).
34.
D. B.
Williams
and
C. B.
Carter
,
Transmission Electron Microscopy: A Textbook for Materials Science
(
Springer
,
2009
).
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