Over the last decade, it has been shown that magnetic non-collinearity at an s-wave superconductor/ferromagnet interface is a key ingredient for spin-singlet to spin-triplet pair conversion. This has been verified in several synthetic non-collinear magnetic structures. A magnetically soft and hard ferromagnetic layer combination in a bilayer structure can function as a field tunable non-collinear magnetic structure, which may offer magnetic field tunability of singlet-to-triplet pair conversion. From magnetization measurements of Nb/Co/Py/Nb multilayers, we demonstrate a reversible enhancement of the superconducting critical temperature of 400 mK by measuring Tc with and without a non-collinear magnetic structure between Co and Py. The sensitivity of Tc in these structures offers the potential for realizing magnetic field tunable Josephson junctions in which pair conversion and Josephson critical currents are controllable using modest magnetic fields.

1.
J.
Linder
and
J. W. A.
Robinson
,
Nat. Phys.
11
,
307
(
2015
).
2.
M. G.
Blamire
and
J. W. A.
Robinson
,
J. Phys.
26
,
453201
(
2014
).
3.
M.
Eschrig
,
Phys. Today
64
(
1
),
43
49
(
2011
).
4.
J. S.
Jiang
,
D.
Davidović
,
D. H.
Reich
, and
C. L.
Chien
,
Phys. Rev. Lett.
74
,
314
(
1995
).
5.
F. S.
Bergeret
,
A. F.
Volkov
, and
K. B.
Efetov
,
Phys. Rev. Lett.
86
,
4096
(
2001
).
6.
I.
Eremin
,
F. S.
Nogueira
, and
R.-J.
Tarento
,
Phys. Rev. B
73
,
054507
(
2006
).
7.
G. B.
Halász
,
M. G.
Blamire
, and
J. W. A.
Robinson
,
Phys. Rev. B
84
,
024517
(
2011
).
8.
L.
Trifunovic
,
Z.
Popović
, and
Z.
Radović
,
Phys. Rev. B
84
,
064511
(
2011
).
9.
A. G.
Mal'shukov
and
A.
Brataas
,
Phys. Rev. B
86
,
094517
(
2012
).
10.
M.
Eschrig
and
T.
Löfwander
,
Nat. Phys.
4
,
138
143
(
2008
).
11.
R. S.
Keizer
,
S. T. B.
Goennenwein
,
T. M.
Klapwijk
,
G.
Miao
,
G.
Xiao
, and
A.
Gupta
,
Nature
439
,
825
827
(
2006
).
12.
M. S.
Anwar
,
F.
Czeschka
,
M.
Hesselberth
,
M.
Porcu
, and
J.
Aarts
,
Phys. Rev. B
82
,
100501(R)
(
2010
).
13.
T. S.
Khaire
,
M.
Khasawneh
,
W. P.
Pratt
, Jr.
, and
N. O.
Birge
,
Phys. Rev. Lett.
104
,
137002
(
2010
).
14.
J. W. A.
Robinson
,
J. D. S.
Witt
, and
M. G.
Blamire
,
Science
329
,
59
61
(
2010
).
15.
D.
Sprungmann
,
K.
Westerholt
,
H.
Zabel
,
M.
Weides
, and
H.
Kohlstedt
,
Phys. Rev. B
82
,
060505(R)
(
2010
).
16.
M.
Houzet
and
A. I.
Buzdin
,
Phys. Rev. B
76
,
060504(R)
(
2007
).
17.
T. E.
Baker
,
A.
Richie-Halford
, and
A.
Bill
,
New J. Phys.
16
,
093048
(
2014
).
18.
J. Y.
Gu
,
J.
Kusnadi
, and
C.-Y.
You
,
Phys. Rev. B
81
,
214435
(
2010
).
19.
L. Y.
Zhu
,
Y.
Liu
,
F. S.
Bergeret
,
J. E.
Pearson
,
S. G. E.
te Velthuis
,
S. D.
Bader
, and
J. S.
Jiang
,
Phys. Rev. Lett.
110
,
177001
(
2013
).
20.
A.
Singh
,
S.
Voltan
,
K.
Lahabi
, and
J.
Aarts
,
Phys. Rev. X
5
,
021019
(
2015
).
21.
A.
Srivastava
,
L. A. B.
Olde Olthof
,
A. D.
Bernardo
,
S.
Komori
,
M.
Amado
,
C.
Palomares-Garcia
,
M.
Alidoust
,
K.
Halterman
,
M. G.
Blamire
, and
J. W. A.
Robinson
,
Phys. Rev. Appl.
8
,
044008
(
2017
).
22.
X. L.
Wang
,
A. D.
Bernardo
,
N.
Banerjee
,
A.
Wells
,
F. S.
Bergeret
,
M. G.
Blamire
, and
J. W. A.
Robinson
,
Phys. Rev. B
89
,
140508(R)
(
2014
).
23.
Z.
Feng
,
J. W. A.
Robinson
, and
M. G.
Blamire
,
Appl. Phys. Lett.
111
,
042602
(
2017
).
24.
R.
Steiner
and
P.
Ziemann
,
Phys. Rev. B
74
,
094504
(
2006
).
25.
A.
Fraile Rodríguez
,
L. J.
Heyderman
,
F.
Nolting
,
A.
Hoffmann
,
J. E.
Pearson
,
L. M.
Doeswijk
,
M. A. F.
van den Boogaart
, and
J.
Brugger
,
Appl. Phys. Lett.
89
,
142508
(
2006
).
26.
F.
Béron
,
A.
Kaidatzis
,
M. F.
Velo
,
L. C. C.
Arzuza
,
E. M.
Palmero
,
R. P.
del Real
,
D.
Niarchos
,
K. R.
Pirota
, and
J. M.
García-Martín
,
Nanoscale Res. Lett.
11
,
86
(
2016
).
27.
S.-S.
Yan
,
J. A.
Barnard
,
F.-T.
Xu
,
J. L.
Weston
, and
G.
Zangari
,
Phys. Rev. B
64
,
184403
(
2001
).
28.
E. F.
Kneller
and
R.
Hawing
,
IEEE Trans. Magn.
27
,
3588
3600
(
1991
).
29.
A.
Bill
and
H. B.
Braun
,
J. Magn. Magn. Mater.
272
,
1266
(
2004
).
30.
S. C.
Hedges
, “
Odd-triplet superconductivity in SmCo/Py exchange spring based Josephson junctions
,” M.S. thesis (
California State University
,
Long Beach
,
2015
).
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