We experimentally demonstrate magnetic nano-oscillators driven by pure spin current produced by the spin Hall effect in a bow tie-shaped nanoconstriction. These devices exhibit single-mode auto-oscillation and generate highly-coherent electronic microwave signals with a significant power and the spectral linewidth as low as 6.2 MHz at room temperature. The proposed simple and flexible device geometry is amenable to straightforward implementation of advanced spintronic structures such as chains of mutually coupled spin-Hall nano-oscillators.
References
1.
V. E.
Demidov
, S.
Urazhdin
, H.
Ulrichs
, V.
Tiberkevich
, A.
Slavin
, D.
Baither
, G.
Schmitz
, and S. O.
Demokritov
, Nat. Mater.
11
, 1028
(2012
).2.
L.
Liu
, C.-F.
Pai
, D. C.
Ralph
, and R. A.
Buhrman
, Phys. Rev. Lett.
109
, 186602
(2012
).3.
R. H.
Liu
, W. L.
Lim
, and S.
Urazhdin
, Phys. Rev. Lett.
110
, 147601
(2013
).4.
V. E.
Demidov
, H.
Ulrichs
, S. V.
Gurevich
, S. O.
Demokritov
, V. S.
Tiberkevich
, A. N.
Slavin
, A.
Zholud
, and S.
Urazhdin
, Nat. Commun.
5
, 3179
(2014
).5.
6.
J. E.
Hirsch
, Phys. Rev. Lett.
83
, 1834
(1999
).7.
A.
Hoffmann
, IEEE Trans. Magn.
49
, 5172
(2013
).8.
V. E.
Demidov
, S.
Urazhdin
, E. R. J.
Edwards
, M. D.
Stiles
, R. D.
McMichael
, and S. O.
Demokritov
, Phys. Rev. Lett
107
, 107204
(2011
).9.
A.
Slavin
and V.
Tiberkevich
, Phys. Rev. Lett.
95
, 237201
(2005
).10.
H.
Ulrichs
, V. E.
Demidov
, and S. O.
Demokritov
, Appl. Phys. Lett.
104
, 042407
(2014
).11.
K.
Ando
, S.
Takahashi
, K.
Harii
, K.
Sasage
, J.
Ieda
, S.
Maekawa
, and E.
Saitoh
, Phys. Rev. Lett.
101
, 036601
(2008
).12.
L.
Liu
, T.
Moriyama
, D. C.
Ralph
, and R. A.
Buhrman
, Phys. Rev. Lett.
106
, 036601
(2011
).13.
V. E.
Demidov
, S.
Urazhdin
, E. R. J.
Edwards
, and S. O.
Demokritov
, Appl. Phys. Lett.
99
, 172501
(2011
).14.
O.
Rousseau
and M.
Viret
, Phys. Rev. B
85
, 144413
(2012
).15.
S.
Kasai
, K.
Kondou
, H.
Sukegawa
, S.
Mitani
, K.
Tsukagoshi
, and Y.
Otani
, Appl. Phys. Lett.
104
, 092408
(2014
).16.
V. E.
Demidov
, S.
Urazhdin
, A. B.
Rinkevich
, G.
Reiss
, and S. O.
Demokritov
, Appl. Phys. Lett.
104
, 152402
(2014
).17.
K.
An
, D. R.
Birt
, C.-F.
Pai
, K.
Olsson
, D. C.
Ralph
, R. A.
Buhrman
, and X.
Li
, Phys. Rev. B
89
, 140405(R)
(2014
).18.
Calculated using COMSOL Multiphysics software from COMSOL, Inc.
19.
N.
Locatelli
, V.
Cros
, and J.
Grollier
, Nat. Mater.
13
, 11
–20
(2014
).20.
The maximum current handled by the studied devices is 8 ± 1 mA.
21.
S. O.
Demokritov
and V. E.
Demidov
, IEEE Trans. Mag.
44
, 6
(2008
).22.
M. J.
Donahue
and D. G.
Porter
, OOMMF User's Guide, Version 1.0
(National Institute of Standards and Technology
, Gaithersburg, MD
, 1999
), Interagency Report NISTIR 6376.23.
Since large densities of the electric current can result in a significant increase of the temperature in the active device area (see, e.g.,
S.
Petit-Watelot
et al. Phys. Rev. Lett.
109
, 267205
(2012
)), the value of the demagnetizing field can be somewhat reduced due to the reduction of the magnetization caused by the Joule heating.24.
S.
Urazhdin
, V. E.
Demidov
, H.
Ulrichs
, T.
Kendziorczyk
, T.
Kuhn
, J.
Leuthold
, G.
Wilde
, and S. O.
Demokritov
, Nat. Nanotechnol.
9
, 509
–513
(2014
).© 2014 AIP Publishing LLC.
2014
AIP Publishing LLC
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