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Effect of Co layer thickness on magnetic relaxation in Pt/Co/Ir/Co/Pt/GaAs spin valve
Morgunov, R.B.,L'vova, G.L.,Talantsev, A.D.,Koplak, O.V.,Fache, T.,Mangin, S. North-Holland Pub. Co 2018 Journal of magnetism and magnetic materials Vol.459 No.-
<P><B>Abstract</B></P> <P>Long magnetic relaxation (up to few hours) between stable magnetic states was analyzed in Pt/Co/Ir/Co/Pt/GaAs heterostructures of different Co layers thickness. The experimental data were compared to a large variety of theoretical models amongst which the <I>Fatuzzo-Labrune</I> one seems to be the more relevant. The contributions from domain nucleation and domain wall motion to magnetic relaxation of the spin valves were separated and evaluated. The increase of Co layer thickness suppresses the domain nucleation and enhances the domain wall propagation. The obtained data provide an understanding of the limitations of switching time in the spin valves of large area necessary for GMR biosensors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> In Pt/Co/Ir/Co/Pt/GaAs heterostructures, magnetic relaxation obeys <I>Fatuzzo-Labrune</I> formalism. </LI> <LI> Contributions of reversal phase and domain walls to the magnetic relaxation of the spin valves were distinguished. </LI> <LI> Reversal phase and domain walls contributions to the magnetic relaxation depend on Co layer thickness. </LI> </UL> </P>
Akulichev, Victor Anatolievich,Bezotvetnykh, Vladimir Victorovich,Morgunov, Yury Nikolaevich,Polovinka, Yury Alexandrovich,Strobykin, Dmitry Sergeevich Korea Institute of Ocean ScienceTechnology 2009 Ocean and Polar Research Vol.31 No.1
When evaluating acoustic methods for measuring physical parameters in the ocean, economical and technical considerations are paramount. As an indirect method of estimating ocean dynamics, acoustic tomography has advantages over more conventional approaches. It allows the reconstruction of temperature and flow fields from the acoustic impulse time-of-flight measured along the rays propagating from the source to the receiver. However, many problems require complicated and expensive systems. To use the acoustic tomography method to best effect, developing hardware systems with sources and receivers mounted permanently on the sea bottom is crucial. Akulichev et al. presented some experimental results from shallow zones of the World Ocean that served as a motive for developing a multifunction system with acoustic hardware and software. Here we present technical features and the sea test results of the system.
Victor Anatolievich Akulichev,Vladimir Victorovich Bezotvetnykh,Yury Nikolaevich Morgunov,Yury Alexandrovich Polovinka,Dmitry Sergeevich Strobykin 한국해양과학기술원 2009 Ocean and Polar Research Vol.31 No.1
When evaluating acoustic methods for measuring physical parameters in the ocean, economical and technical considerations are paramount. As an indirect method of estimating ocean dynamics, acoustic tomography has advantages over more conventional approaches. It allows the reconstruction of temperature and flow fields from the acoustic impulse time-of-flight measured along the rays propagating from the source to the receiver. However, many problems require complicated and expensive systems. To use the acoustic tomography method to best effect, developing hardware systems with sources and receivers mounted permanently on the sea bottom is crucial. Akulichev et al. presented some experimental results from shallow zones of the World Ocean that served as a motive for developing a multifunction system with acoustic hardware and software. Here we present technical features and the sea test results of the system.
Remote Acoustic Sensing methods for Studies in Oceanology
Victor A. Akulichev,Vladimir V. Bezotvetnykh,Alexander V. Burenin,Engeny A. Voytenko,Sergey I. Kamenev,Yury N. Morgunov,Yury A. Polovinka,Dmitry S. Strobykin 한국해양과학기술원 2006 Ocean science journal Vol.41 No.2
In this paper, the lines of investigation on a problem of the development of remote acoustic sensing methods in oceanology are formulated. This paper summarizes the results of investigations into the possibilities for monitoring temperature and flow fields in shallow seas. In the discussed experiments, the instrumentation being constituents of the complex for long-duration remote monitoring of marine medium climatic variability and that of the acoustic tomography of shallow sea dynamic processes is used. The acoustic instruments were located on the POI FEB RAS acousto-hydrophysical polygon (Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences) near the Gamov Peninsula. Acoustic receiving and transmitting systems operating with multiplex phase-manipulated signals (of M-codes) at frequency range 250-2500 Hz form the basis for this complex.
Talantsev, A,Lu, Y,Fache, T,Lavanant, M,Hamadeh, A,Aristov, A,Koplak, O,Morgunov, R,Mangin, S IOP 2018 Journal of Physics, Condensed Matter Vol.30 No.13
<P>Two synthetic antiferromagnet bilayer systems with strong perpendicular anisotropy CoFeB/Ta/CoFeB and Pt/Co/Ir/Co/Pt have been grown using sputtering techniques. For both systems two types of magnetization transitions have been studied. The first one concerns transitions from a state where magnetizations of the two magnetic layers are parallel (<I>P</I> state) to a state where magnetizations of the two layers are aligned antiparallel (<I>AP</I> state). The second one concerns transitions between the two possible antiparallel alignments (<I>AP</I>+ to <I>AP</I>−). For both systems and both transitions after-effect measurements can be understood in the frame of nucleation—propagation model. Time derivative analysis of magnetic relaxation curves and mapping of the first order reversal curves at different temperature allowed us to demonstrate the presence of different pinning centers, which number can be controlled by magnetic field and temperature.</P>
Remote Acoustic Sensing Methods for Studies in Oceanology
Akulichev, Victor A.,Bezotvetnykh, Vladimir V.,Burenin, Alexander V.,Voytenko, Evgeny A.,Kamenev, Sergey I.,Morgunov, Yury N.,Polovinka, Yury A.,Strobykin, Dmitry S. The Korean Society of Oceanography 2006 Ocean science journal Vol.41 No.2
In this paper, the lines of investigation on a problem of the development of remote acoustic sensing methods in oceanology are formulated. This paper summarizes the results of investigations into the possibilities for monitoring temperature and flow fields in shallow seas. In the discussed experiments, the instrumentation being constituents of the complex for long-duration remote monitoring of marine medium climatic variability and that of the acoustic tomography of shallow sea dynamic processes is used. The acoustic instruments were located on the POI FEB RAS acousto-hydrophysical polygon (Pacific Oceanological Institute, Far Eastern Branch of the Russian Academy of Sciences) near the Gamov Peninsula. Acoustic receiving and transmitting systems operating with multiplex phase-manipulated signals (of M-codes) at frequency range 250-2500 Hz form the basis for this complex.