We have studied the effect of He+ irradiation on the dynamics of chiral domain walls in Pt/Co/AlOx trilayers in the creep regime. Irradiation leads to a strong decrease in the depinning field and a non-monotonous change of the effective pinning barriers. The variations of domain wall dynamics result essentially from the strong decrease in the effective anisotropy constant, which increases the domain wall width. The latter is found to present a perfect scaling with the length-scale of the interaction between domain wall and disorder, ξ. On the other hand, the strength of the domain wall–disorder interaction, fpin, is weakly impacted by the irradiation, suggesting that the length-scales of the disorder fluctuation remain smaller than the domain wall width.

1.
C.
Chappert
,
H.
Bernas
,
J.
Ferre
,
V.
Kottler
,
J.-P.
Jamet
,
Y.
Chen
,
E.
Cambril
,
T.
Devolder
,
F.
Rousseaux
,
V.
Mathet
, and
H.
Launois
, “
Planar patterned magnetic media obtained by ion irradiation
,”
Science
280
,
1919
1922
(
1998
).
2.
T.
Devolder
, “
Light ion irradiation of Co/Pt systems: Structural origin of the decrease in magnetic anisotropy
,”
Phys. Rev. B
62
,
5794
5802
(
2000
).
3.
T.
Devolder
,
S.
Pizzini
,
J.
Vogel
,
H.
Bernas
,
C.
Chappert
,
V.
Mathet
, and
M.
Borowski
, “
X-ray absorption analysis of sputter-grown Co/Pt stackings before and after helium irradiation
,”
Eur. Phys. J. B
22
,
193
(
2001
).
4.
J.
Fassbender
,
D.
Ravelosona
, and
Y.
Samson
, “
Tailoring magnetism by light-ion irradiation
,”
J. Phys. D: Appl. Phys.
37
,
R179
(
2004
).
5.
A. L.
Balk
,
K.-W.
Kim
,
D. T.
Pierce
,
M. D.
Stiles
,
J.
Unguris
, and
S. M.
Stavis
, “
Simultaneous control of the Dzyaloshinskii–Moriya interaction and magnetic anisotropy in nanomagnetic trilayers
,”
Phys. Rev. Lett.
119
,
077205
(
2017
).
6.
A.
Sud
,
S.
Tacchi
,
D.
Sagkovits
,
C.
Barton
,
M.
Sall
,
L. H.
Diez
,
E.
Stylianidis
,
N.
Smith
,
L.
Wright
,
S.
Zhang
,
X.
Hang
,
D.
Ravelosona
,
G.
Carlotti
,
H.
Kurebayashi
,
O.
Kazakova
, and
M.
Cubukcu
, “
Tailoring interfacial effect in multilayers with Dzyaloshinskii–Moriya interaction by helium ion irradiation
,”
Sci. Rep.
11
,
023626
(
2021
).
7.
R.
Juge
,
K.
Bairagi
,
K. G.
Rana
,
J.
Vogel
,
M.
Sall
,
D.
Mailly
,
V. T.
Pham
,
Q.
Zhang
,
N.
Sisodia
,
M.
Foerster
,
L.
Aballe
,
M.
Belmeguenai
,
Y.
Roussigné
,
S.
Auffret
,
L. D.
Buda-Prejbeanu
,
G.
Gaudin
,
D.
Ravelosona
, and
O.
Boulle
, “
Helium ions put magnetic skyrmions on the track
,”
Nano Lett.
21
,
2989
2996
(
2021
).
8.
M. C. H.
de Jong
,
M. J.
Meijer
,
J.
Lucassen
,
J.
van Liempt
,
H. J. M.
Swagten
,
B.
Koopmans
, and
R.
Lavrijsen
, “
Local control of magnetic interface effects in chiral Ir | Co | Pt multilayers using Ga+ ion irradiation
,”
Phys. Rev. B
105
,
064429
(
2022
).
9.
L. H.
Diez
,
F.
García-Sánchez
,
J.-P.
Adam
,
T.
Devolder
,
S.
Eimer
,
M. S. E.
Hadri
,
A.
Lamperti
,
R.
Mantovan
,
B.
Ocker
, and
D.
Ravelosona
, “
Controlling magnetic domain wall motion in the creep regime in He+-irradiated CoFeB/MgO films with perpendicular anisotropy
,”
Appl. Phys. Lett.
107
,
032401
(
2015
).
10.
J. W.
van der Jagt
,
V.
Jeudy
,
A.
Thiaville
,
M.
Sall
,
N.
Vernier
,
L.
Herrera Diez
,
M.
Belmeguenai
,
Y.
Roussigné
,
S. M.
Chérif
,
M.
Fattouhi
,
L.
Lopez-Diaz
,
A.
Lamperti
,
R.
Juge
, and
D.
Ravelosona
, “
Revealing nanoscale disorder in W/Co-Fe-B/MgO ultrathin films using domain-wall motion
,”
Phys. Rev. Appl.
18
,
054072
(
2022
).
11.
J.
Ferré
,
C.
Chappert
,
H.
Bernas
,
J.-P.
Jamet
,
P.
Meyer
,
O.
Kaitasov
,
S.
Lemerle
,
V.
Mathet
,
F.
Rousseaux
, and
H.
Launois
, “
Irradiation induced effects on magnetic properties of Pt/Co/Pt ultrathin films
,”
J. Magn. Magn. Mater.
198–199
,
191
193
(
1999
).
12.
D.
Weller
,
J.
Stöhr
,
R.
Nakajima
,
A.
Carl
,
M. G.
Samant
,
C.
Chappert
,
R.
Mégy
,
P.
Beauvillain
,
P.
Veillet
, and
G. A.
Held
, “
Microscopic origin of magnetic anisotropy in Au/Co/Au probed with x-ray magnetic circular dichroism
,”
Phys. Rev. Lett.
75
,
3752
3755
(
1995
).
13.
V.
Jeudy
,
A.
Mougin
,
S.
Bustingorry
,
W.
Savero Torres
,
J.
Gorchon
,
A. B.
Kolton
,
A.
Lemaître
, and
J.-P.
Jamet
, “
Universal pinning energy barrier for driven domain walls in thin ferromagnetic films
,”
Phys. Rev. Lett.
117
,
057201
(
2016
).
14.
R. D.
Pardo
,
W.
Savero Torres
,
A. B.
Kolton
,
S.
Bustingorry
, and
V.
Jeudy
, “
Universal depinning transition of domain walls in ultrathin ferromagnets
,”
Phys. Rev. B
95
,
184434
(
2017
).
15.
R.
Díaz Pardo
,
N.
Moisan
,
L. J.
Albornoz
,
A.
Lemaître
,
J.
Curiale
, and
V.
Jeudy
, “
Common universal behavior of magnetic domain walls driven by spin-polarized electrical current and magnetic field
,”
Phys. Rev. B
100
,
184420
(
2019
).
16.
S.
Lemerle
,
J.
Ferré
,
C.
Chappert
,
V.
Mathet
,
T.
Giamarchi
, and
P.
Le Doussal
, “
Domain wall creep in an Ising ultrathin magnetic film
,”
Phys. Rev. Lett.
80
,
849
(
1998
).
17.
L. J.
Albornoz
,
P. C.
Guruciaga
,
V.
Jeudy
,
J.
Curiale
, and
S.
Bustingorry
, “
Domain-wall roughness in GdFeCo thin films: Crossover length scales and roughness exponents
,”
Phys. Rev. B
104
,
024203
(
2021
).
18.
P.
Géhanne
,
S.
Rohart
,
A.
Thiaville
, and
V.
Jeudy
, “
Strength and length scale of the interaction between domain walls and pinning disorder in thin ferromagnetic films
,”
Phys. Rev. Res.
2
,
043134
(
2020
).
19.
T. H.
Pham
,
J.
Vogel
,
J.
Sampaio
,
M.
Vanatka
,
J.-C.
Rojas-Sanchez
,
M.
Bonfim
,
D. S.
Chaves
,
F.
Choueikani
,
P.
Ohresser
,
E.
Otero
,
A.
Thiaville
, and
S.
Pizzini
, “
Very large domain wall velocities in Pt/Co/GdOx and Pt/Co/Gd trilayers with Dzyaloshinskii–Moriya interaction
,”
EPL
113
,
67001
(
2016
).
20.
A.
Thiaville
,
S.
Rohart
,
E.
Jué
,
V.
Cros
, and
A.
Fert
, “
Dynamics of Dzyaloshinskii domain walls in ultrathin magnetic films
,”
EPL
100
,
57002
(
2012
).
21.
I. E.
Dzyaloshinskii
, “
Thermodynamic theory of ‘weak’ ferromagnetism in antiferromagnetic substances
,”
Sov. Phys. JETP
5
,
1259
(
1957
).
22.
T.
Moriya
, “
Anisotropic superexchange interaction and weak ferromagnetism
,”
Phys. Rev.
120
,
91
(
1960
).
23.
V.
Krizakova
,
J.
Peña Garcia
,
J.
Vogel
,
D.
de Souza Chaves
,
S.
Pizzini
, and
A.
Thiaville
, “
Study of the velocity plateau of Dzyaloshinskii domain walls
,”
Phys. Rev. B
100
,
214404
(
2019
).
24.
V.
Jeudy
,
R.
Díaz Pardo
,
W.
Savero Torres
,
S.
Bustingorry
, and
A. B.
Kolton
, “
Pinning of domain walls in thin ferromagnetic films
,”
Phys. Rev. B
98
,
054406
(
2018
).
25.
S.
Bustingorry
,
A. B.
Kolton
, and
T.
Giamarchi
, “
Thermal rounding exponent of the depinning transition of an elastic string in a random medium
,”
Phys. Rev. E
85
,
021144
(
2012
).
26.
S.-G.
Je
,
D.-H.
Kim
,
S.-C.
Yoo
,
B.-C.
Min
,
K.-J.
Lee
, and
S.-B.
Choe
,
Phys. Rev. B
88
,
214401
(
2013
).
27.
T.
Nattermann
, “
Scaling approach to pinning: Charge density waves and giant flux creep in superconductors
,”
Phys. Rev. Lett.
64
,
2454
(
1990
).
You do not currently have access to this content.