ULTRASPIN is an apparatus devoted to the measurement of the spin polarization (SP) of electrons ejected from solid surfaces in a UHV environment. It is designed to exploit ultrafast light sources (free electron laser or laser high harmonic generation) and to perform (photo)electron spin analysis by an arrangement of Mott scattering polarimeters that measure the full SP vector. The system consists of two interconnected UHV vessels: one for surface science sample cleaning treatments, e-beam deposition of ultrathin films, and low energy electron diffraction/AES characterization. The sample environment in the polarimeter allows for cryogenic cooling and in-operando application of electric and magnetic fields. The photoelectrons are collected by an electrostatic accelerator and transport lens that form a periaxial beam that is subsequently directed by a Y-shaped electrostatic deflector to either one of the two orthogonal Mott polarimeters. The apparatus has been designed to operate in the extreme conditions of ultraintense single-X-ray pulses as originated by free electron lasers (up to 1 kHz), but it allows also for the single electron counting mode suitable when using statistical sources such as synchrotron radiation, cw-laser, or e-gun beams (up to 150 kcps).

1.
A.
Scholl
,
L.
Baumgarten
,
R.
Jacquemin
, and
W.
Eberhardt
,
Phys. Rev. Lett.
79
,
5146
(
1997
).
2.
J.-Y.
Bigot
,
M.
Vomir
, and
E.
Beaurepaire
,
Nat. Phys.
5
,
515
(
2009
).
3.
I.
Tudosa
,
C.
Stamm
,
A. B.
Kashuba
,
F.
King
,
H. C.
Siegmann
,
J.
Stöhr
,
G.
Ju
,
B.
Lu
, and
D.
Weller
,
Nature
428
,
831
(
2004
).
4.
B.
Koopmans
,
M.
Van Kampen
,
J. T.
Kohlhepp
, and
W. J. M.
De Jonge
,
Phys. Rev. Lett.
85
,
844
(
2000
).
5.
C.
Stamm
,
T.
Kachel
,
N.
Pontius
,
R.
Mitzner
,
T.
Quast
,
K.
Holldack
,
S.
Khan
,
C.
Lupulescu
,
E. F.
Aziz
,
M.
Wietstruk
,
H. A.
Dürr
, and
W.
Eberhardt
,
Nat. Mater.
6
,
740
(
2007
).
6.
G. P.
Zhang
,
W.
Hübner
,
G.
Lefkidis
,
Y.
Bai
, and
T. F.
George
,
Nat. Phys.
5
,
499
(
2009
).
7.
M.
Krauß
,
T.
Roth
,
S.
Alebrand
,
D.
Steil
,
M.
Cinchetti
,
M.
Aeschlimann
, and
H. C.
Schneider
,
Phys. Rev. B
80
,
180407(R)
(
2009
).
8.
B.
Koopmans
,
G.
Malinowski
,
F.
Dalla Longa
,
D.
Steiauf
,
M.
Fähnle
,
T.
Roth
,
M.
Cinchetti
, and
M.
Aeschlimann
,
Nat. Mater.
9
,
259
(
2010
).
9.
B.
Koopmans
,
J. J. M.
Ruigrok
,
F.
Dalla Longa
, and
W. J. M.
De Jonge
,
Phys. Rev. Lett.
95
,
1
(
2005
).
10.
M.
Battiato
, “
Superdiffusive spin transport and ultrafast magnetization dynamics
,” Ph.D. thesis,
Uppsala Universitet, Department of Physics and Astronomy, Materials Theory
,
2013
.
11.
M.
Battiato
,
K.
Carva
, and
P. M.
Oppeneer
,
Phys. Rev. Lett.
105
,
027203
(
2010
).
12.
G.
Malinowski
,
F.
Dalla Longa
,
J. H. H.
Rietjens
,
P. V.
Paluskar
,
R.
Huijink
,
H. J. M.
Swagten
, and
B.
Koopmans
,
Nat. Phys.
4
,
855
(
2008
).
13.
A.
Kirilyuk
,
A. V.
Kimel
, and
T.
Rasing
,
Rev. Mod. Phys.
82
,
2731
(
2010
).
14.
C.
Spezzani
,
E.
Ferrari
,
E.
Allaria
,
F.
Vidal
,
A.
Ciavardini
,
R.
Delaunay
,
F.
Capotondi
,
E.
Pedersoli
,
M.
Coreno
,
C.
Svetina
,
L.
Raimondi
,
M.
Zangrando
,
R.
Ivanov
,
I.
Nikolov
,
A.
Demidovich
,
M. B.
Danailov
,
H.
Popescu
,
M.
Eddrief
,
G.
De Ninno
,
M.
Kiskinova
, and
M.
Sacchi
,
Phys. Rev. Lett.
113
,
1
(
2014
).
15.
D.
Doering
,
Y. D.
Chuang
,
N.
Andresen
,
K.
Chow
,
D.
Contarato
,
C.
Cummings
,
E.
Domning
,
J.
Joseph
,
J. S.
Pepper
,
B.
Smith
,
G.
Zizka
,
C.
Ford
,
W. S.
Lee
,
M.
Weaver
,
L.
Patthey
,
J.
Weizeorick
,
Z.
Hussain
, and
P.
Denes
,
Rev. Sci. Instrum.
82
,
073303
(
2011
).
16.
H.-C.
Mertins
,
D.
Abramsohn
,
A.
Gaupp
,
F.
Schäfers
,
W.
Gudat
,
O.
Zaharko
,
H.
Grimmer
, and
P.
Oppeneer
,
Phys. Rev. B
66
,
184404
(
2002
).
17.
A.
Weber
,
F.
Pressacco
,
S.
Günther
,
E.
Mancini
,
P. M.
Oppeneer
, and
C. H.
Back
,
Phys. Rev. B
84
,
1
(
2011
).
18.
T.
Michlmayr
,
A.
Fognini
,
T.
Bähler
,
G.
Salvatella Orgillés
,
C.
Wetli
,
A.
Vaterlaus
, and
Y.
Acremann
,
J. Korean Phys. Soc.
62
,
2202
(
2013
).
19.
A.
Fognini
,
T. U.
Michlmayr
,
G.
Salvatella
,
C.
Wetli
,
U.
Ramsperger
,
T.
Bähler
,
F.
Sorgenfrei
,
M.
Beye
,
A.
Eschenlohr
,
N.
Pontius
,
C.
Stamm
,
F.
Hieke
,
M.
Dell’Angela
,
S.
De Jong
,
R.
Kukreja
,
N.
Gerasimova
,
V.
Rybnikov
,
A.
Al-Shemmary
,
H.
Redlin
,
J.
Raabe
,
A.
Föhlisch
,
H. A.
Dürr
,
W.
Wurth
,
D.
Pescia
,
A.
Vaterlaus
, and
Y.
Acremann
,
Appl. Phys. Lett.
104
,
103
(
2014
).
20.
A.
Fognini
,
G.
Salvatella
,
T. U.
Michlmayr
,
C.
Wetli
,
U.
Ramsperger
,
T.
Bähler
,
F.
Sorgenfrei
,
M.
Beye
,
A.
Eschenlohr
,
N.
Pontius
,
C.
Stamm
,
F.
Hieke
,
M.
Dell’Angela
,
S.
de Jong
,
R.
Kukreja
,
N.
Gerasimova
,
V.
Rybnikov
,
H.
Redlin
,
J.
Raabe
,
A.
Föhlisch
,
H. A.
Dürr
,
W.
Wurth
,
D.
Pescia
,
A.
Vaterlaus
, and
Y.
Acremann
,
New J. Phys.
16
,
043031
(
2014
).
21.
O. M.
Paul
, “
Determination of energy-resolved inelastic mean free paths of electrons with spin-polarized secondary and Auger electron spectroscopy
,” Doctoral and Habilitation thesis,
Eidgenössische Technische Hochschule Zürich
,
1990
.
22.
O.
Paul
,
M.
Taborelli
, and
M.
Landolt
,
Surf. Sci.
211-212
,
724
(
1989
).
23.
G.
Rossi
, in
Synchrotron Radiation
, edited by
S.
Mobilio
, et al
(
Springer-Verlag GmbH
,
Berlin, Heidelberg
,
2015
), pp.
539
570
.
24.
V. N.
Petrov
,
V. V.
Grebenshikov
,
B. D.
Grachev
, and
A. S.
Kamochkin
,
Rev. Sci. Instrum.
74
,
1278
(
2003
).
25.
J.
Kessler
,
Polarized Electrons
, 2nd ed. (
Springer-Verlag GmbH
,
Berlin, Heidelberg
,
1985
).
26.
M.
Getzlaff
,
B.
Heidemann
,
J.
Bansmann
,
C.
Westphal
, and
G.
Schönhense
,
Rev. Sci. Instrum.
69
,
3913
(
1998
).
27.
T. J.
Gay
and
F. B.
Dunning
,
Rev. Sci. Instrum.
63
,
1635
(
1992
).
28.
G. C.
Burnett
,
T. J.
Monroe
, and
F. B.
Dunning
,
Rev. Sci. Instrum.
65
,
1893
(
1994
).
29.
D.
Kutnyakhov
,
P.
Lushchyk
,
A.
Fognini
,
D.
Perriard
,
M.
Kolbe
,
K.
Medjanik
,
E.
Fedchenko
,
S. A.
Nepijko
,
H. J.
Elmers
,
G.
Salvatella
,
C.
Stieger
,
R.
Gort
,
T.
Bähler
,
T.
Michlmayer
,
Y.
Acremann
,
A.
Vaterlaus
,
F.
Giebels
,
H.
Gollisch
,
R.
Feder
,
C.
Tusche
,
A.
Krasyuk
,
J.
Kirschner
, and
G.
Schönhense
,
Ultramicroscopy
130
,
63
(
2013
).
30.
J.
Kirschner
,
F.
Giebels
,
H.
Gollisch
, and
R.
Feder
,
Phys. Rev. B
88
,
1
(
2013
).
31.
R.
Bertacco
,
M.
Merano
, and
F.
Ciccacci
,
Appl. Phys. Lett.
72
,
2050
(
1998
).
32.
T.
Okuda
,
K.
Miyamaoto
,
H.
Miyahara
,
K.
Kuroda
,
A.
Kimura
,
H.
Namatame
, and
M.
Taniguchi
,
Rev. Sci. Instrum.
82
,
103302
(
2011
).
33.
N. F.
Mott
,
Proc. R. Soc. A.
124
,
425
(
1929
).
34.
N. F.
Mott
,
Proc. R. Soc. A.
135
,
429
(
1932
).
35.
A.
Gellrich
and
J.
Kessler
,
Phys. Rev. A
43
,
204
(
1991
).
36.
T.
Pincelli
 et al, “
Performance of different photoelectron spin polarimeter geometries with shortly pulsed lightsources: A statistical study
,”
Nucl. Instrum. Methods Phys. Res., Sect. A
(submitted).
37.
M.
Hoesch
,
T.
Greber
,
V. N.
Petrov
,
M.
Muntwiler
,
M.
Hengsberger
,
W.
Auwärter
, and
J.
Osterwalder
,
J. Electron Spectrosc. Relat. Phenom.
124
,
263
(
2002
).
38.
M.
Hoesch
,
M.
Muntwiler
,
V. N.
Petrov
,
M.
Hengsberger
,
L.
Patthey
,
M.
Shi
,
M.
Falub
,
T.
Greber
, and
J.
Osterwalder
,
Phys. Rev. B
69
,
1
(
2004
).
39.
H. A.
Rijken
,
S. S.
Klein
,
W.
Jacobs
,
L. J. H. G. W.
Teeuwen
,
M. J. A.
de Voigt
, and
P.
Burger
,
Nucl. Instrum. Methods Phys. Res., Sect. B
64
,
272
(
1992
).
40.
J.
Kemmer
,
Nucl. Instrum. Methods
169
,
499
(
1980
).
41.
G. W.
Simmons
and
D. J.
Dwyer
,
Surf. Sci.
48
,
373
(
1975
).
42.

In a stable source such as the seeded FEL Fermi@Elettra shot-to-shot intensity, fluctuations are evaluated as 20% rms when the system is used without a monochromator. When a monochromator is used, even larger fluctuations are present, as also energy fluctuations are converted in intensity changes and add up to the noise.

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