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Magnetic-field-induced domain-wall motion in permalloy nanowires with modified Gilbert damping
DOI:
10.1103/PhysRevB.82.094445
Authors:
Thomas A.
Moore
(Universität Konstanz)
,
Phillipe
Mohrke
(University of Konstanz)
,
Lutz
Heyne
(University of Konstanz)
,
Andreas
Kaldun
(Universität Konstanz)
,
Mathias
Kläui
(Universität Konstanz)
,
Dirk
Backes
(Paul Scherrer Institut)
,
Jan
Rhensius
(Paul Scherrer Institut)
,
Laura J.
Heyderman
(Paul Scherrer Institut)
,
Jan-Ulrich
Thiele
(Hitachi Global Storage Technology)
,
Georg
Woltersdorf
(Universität Regensburg)
,
Arantxa
Rodriguez
(Paul Scherrer Institut)
,
Frithjof
Nolting
(Paul Scherrer Institut)
,
Tevfik
Mentes
(Sincrotrone Trieste)
,
Miguel
Nino
(Elettra – Sincrotrone Trieste)
,
Andrea
Locatelli
(Elettra – Sincrotrone Trieste)
,
Alessandro
Potenza
(Diamond Light Source)
,
Helder
Marchetto
(Diamond Light Source)
,
Stuart
Cavill
(University of York, Diamond Light Source)
,
Sarnjeet S.
Dhesi
(Diamond Light Source)
Co-authored by industrial partner:
Yes
Type:
Journal Paper
Journal:
Physical Review B
, VOL 82 (9)
State:
Published (Approved)
Published:
September 2010
Abstract: Domain wall (DW) depinning and motion in the viscous regime induced by magnetic fields, are investigated in planar permalloy nanowires in which the Gilbert damping is tuned in the range 0.008–0.26 by doping with Ho. Real time, spatially resolved magneto-optic Kerr effect measurements yield depinning field distributions and DW mobilities. Depinning occurs at discrete values of the field which are correlated with different metastable DW states and changed by the doping. For α<0.033, the DW mobilities are smaller than expected while for α>=0.033, there is agreement between the measured DW mobilities and those predicted by the standard one-dimensional model of field-induced DW motion. Micromagnetic simulations indicate that this is because as increases, the DW spin structure becomes increasingly rigid. Only when the damping is large can he DW be approximated as a pointlike quasiparticle that exhibits the simple translational motion predicted in the viscous regime. When the damping is small, the DW spin structure undergoes periodic distortions that lead to a velocity reduction. We therefore show that Ho doping of permalloy nanowires enables engineering of the DW depinning and mobility, as well as the extent of the viscous regime.
Diamond Keywords: Data Storage
Subject Areas:
Physics,
Materials,
Information and Communication Technology
Instruments:
I06-Nanoscience (XPEEM)
Other Facilities: Elettra; Swiss Light Source
Added On:
18/10/2010 09:35
Discipline Tags:
Physics
Components & Micro-systems
Information & Communication Technologies
Magnetism
Materials Science
Nanoscience/Nanotechnology
Technical Tags:
Microscopy
Spectroscopy
Electron Microscopy (EM)
PhotoEmmission Electron Microscopy (PEEM)
Circular Dichroism (CD)
X-ray Magnetic Circular Dichroism (XMCD)