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  • 1
    Language: English
    In: Physica B: Physics of Condensed Matter, 01 June 2012, Vol.407(11), pp.1753-1756
    Description: Earlier it has been found that the signal produced by a moving CDW contains along with fundamental of narrow band frequency ( ) and its harmonics ( ) a non-coherent part—a lot of non-coherent oscillations. Due to a rather broad frequency range the power associated with non-coherent oscillations is comparable to or even greater than that for fundamental frequency, and hence, can play an essential role in CDW dynamics. Now we report on the phase analysis of non-coherent part of the signal produced by moving CDW in thin samples of o TaS . To obtain frequency resolved phase characteristics of a signal with fast varying amplitude and abrupt phase jumps the wavelet transform has been performed using complex Morlet functions as a base. It was found that the frequencies from a rather narrow band around (typically Δ ≈0.25) are tightly locked together and form the main harmonic of narrow band signal. Similarly, the frequencies close to are also tightly locked. Outside these narrow bands the oscillations are essentially non-coherent. The characteristic feature for these non-coherent oscillations is the following very specific phase synchronization process. Two very close frequency components manifest simultaneous abrupt phase shifts. For one component the phase is shifted by (forward), while for the other it is shifted by − (backward). A most remarkable feature of this locking process is that the resultant phase shift between very close frequency components of non-coherent signal is every time exactly 2 . These observations are considered in terms of CDW velocity redistribution accompanying its motion in an electrical field.
    Keywords: Charge Density Wave ; Non-Linear Dynamics ; Tas3 ; Engineering ; Physics
    ISSN: 0921-4526
    E-ISSN: 1873-2135
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  • 2
    Language: English
    In: Proceedings Of The 55th Annual Conference On Magnetism And Magnetic Materials, Atlanta, Georgia (14-18 November 2010):
    In: Journal of Applied Physics, 01 April 2011, Vol.109(7)
    Description: We present here a concept of a memory cell called MELRAM based on a magnetic element with giant magnetostriction, embedded in a piezoelectric matrix. Two equilibrium orientations of magnetization are defined by combining uniaxial anisotropy together with a magnetic polarization in the hard axis direction. Using the piezoelectric matrix, an anisotropic stress is created onto the magnetic element when applying a voltage across electrodes. Thanks to the inverse magnetostrictive effect, the effective anisotropy of the magnetic element is controlled by the applied voltage and used to switch magnetization from one state to the other. Micromagnetic simulations show the effect of applied stress on magnetization and theoretical feasibility of the device. Retrieval of information can be nondestructively made by giant magnetoresistance reading. Details of the principle, simulations, and performance perspectives are discussed.
    Keywords: Proceedings Of The 55th Annual Conference On Magnetism And Magnetic Materials
    ISSN: 0021-8979
    E-ISSN: 1089-7550
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  • 3
    Language: English
    In: Proceedings Of The 55th Annual Conference On Magnetism And Magnetic Materials, Atlanta, Georgia (14-18 November 2010):
    In: Journal of Applied Physics, 07 May 2013, Vol.113(17)
    Description: We present here the implementation of a magnetoelectric memory with a voltage driven writing method using a ferroelectric relaxor substrate. The memory point consists of a magnetoelastic element in which two orthogonal stable magnetic states are defined by combining uni-axial anisotropy together with a magnetic polarization in the hard axis direction. Using a ferroelectric relaxor substrate, an anisotropic stress is created in the magnetic element when applying a voltage across electrodes. Because of the inverse magnetostrictive effect, the effective anisotropy of the magnetic element is controlled by the applied voltage and used to switch magnetization from one state to the other.
    Keywords: Proceedings Of The 12th Joint Mmm-Intermag Conference
    ISSN: 0021-8979
    E-ISSN: 1089-7550
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  • 4
    Language: English
    In: Journal of Applied Physics, 01 March 2012, Vol.111(5)
    Description: The possibility of control and tuning of the band structures of phononic crystals offered by the introduction of an active magnetoelastic material and the application of an external magnetic field is studied. Two means to obtain large elastic properties variations in magnetoelastic material are considered: Giant magnetostriction and spin reorientation transition effects. A plane wave expansion method is used to calculate the band structures. The magnetoelastic coupling is taken into account through the consideration of an equivalent piezomagnetic material model with elastic, piezomagnetic, and magnetic permeability tensors varying as a function of the amplitude and orientation of the applied magnetic field. Results of contactless tunability of the absolute bandgap are presented for a two-dimensional phononic crystal constituted of Terfenol-D square rod embedded in an epoxy matrix.
    Keywords: Articles
    ISSN: 0021-8979
    E-ISSN: 1089-7550
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  • 5
    Language: English
    In: Journal of Applied Physics, April 1, 2011, Vol.109(7), p.07A720 -1-07A720 -3
    Description: The application of the micromagnetic simulations for the generation of the biasing structure and pattern in the magnetic films is demonstrated. The article presents a complete characterization of a series of patterned [L1.sub.0]-FePt for polarization of magnetic films.
    Keywords: Iron Compounds -- Magnetic Properties ; Iron Compounds -- Structure ; Magnetic Fields -- Analysis ; Platinum -- Magnetic Properties ; Platinum -- Structure ; Polarization (Electricity) -- Analysis
    ISSN: 0021-8979
    Source: Cengage Learning, Inc.
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  • 6
    Language: English
    In: Applied Physics Letters, 22 February 2016, Vol.108(8)
    Description: The motion of a ferromagnetic domain wall in nanodevices is usually induced by means of external magnetic fields or polarized currents. Here, we demonstrate the possibility to reversibly control the position of a Néel domain wall in a ferromagnetic nanostripe through a uniform mechanical stress. The latter is generated by an electro-active substrate combined with the nanostripe in a multiferroic heterostructure. We develop a model describing the magnetization distribution in the ferromagnetic material, properly taking into account the magnetoelectric coupling. Through its numerical implementation, we obtain the relationship between the electric field applied to the piezoelectric substrate and the position of the magnetic domain wall in the nanostripe. As an example, we analyze a structure composed of a PMN-PT substrate and a TbCo 2 /FeCo composite nanostripe.
    Keywords: Magnetics And Spintronics
    ISSN: 0003-6951
    E-ISSN: 1077-3118
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  • 7
    Language: English
    In: Applied Physics Letters, 07 November 2011, Vol.99(19)
    Description: We present here the demonstration of magnetoelectric switching of magnetization between two stable positions defined by a combination of anisotropy and magnetic field. A magnetoelastic nanostructured multilayer with the required uni-axial characteristic was deposited onto a commercial piezoelectric actuator. Thanks to the inverse magnetostrictive effect, the effective anisotropy of the magnetic element is controlled by the applied voltage and used to switch magnetization from one state to the other. Both vibrating sample magnetometer and magneto-optical Kerr effect measurements have been performed and demonstrate the magnetoelectric switching.
    Keywords: Magnetism And Superconductivity
    ISSN: 0003-6951
    E-ISSN: 1077-3118
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  • 8
    Language: English
    In: Journal of Applied Physics, 01 May 2010, Vol.107(9)
    Description: The results of experimental and theoretical studies of ferromagnetic resonance (FMR) and magnetoelastic excitations near the spin reorientation transition (SRT) in an uniaxial TbCo 2 / FeCo layered nanostructure and a La 0.7 Sr 0.3 MnO 3 film are reported. Experimental dependences of the amplitude of the reflected microwave signal versus the external magnetic field strength are presented in comparison with the theoretical ones. An increase in FMR reflectivity in the vicinity of SRT is clearly demonstrated. Low frequency magnetoelastic excitation of flexural vibrations of the samples by means of modulated microwave electromagnetic field is observed experimentally using a laser beam deflection technique. The increase in amplitude of vibrations at modulation frequency under combined FMR and SRT conditions is observed in agreement with the theory.
    Keywords: Articles
    ISSN: 0021-8979
    E-ISSN: 1089-7550
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  • 9
    Language: Bulgarian
    In: Проблеми на изкуството, 2017, Issue 1, pp.54-56
    Keywords: History ; Scientifc Life ; Visual Arts
    ISSN: 0032-9371
    Source: Central and Eastern European Online Library (C.E.E.O.L.)
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  • 10
    Language: Russian
    In: Literatūra, 2015, Vol.57(5), pp.238-245
    Description: The situation of heterotopia naturally appears in the areas in which multinational cultural and historic context creates premises for ambiguous choice of interpreting the message text, i.e., the areas where the common interpretative convention does not exist. Such premises have been a typical...
    Keywords: Phonetics / Phonology ; Lexis ; Semantics ; Belarussian Literature ; Bulgarian Literature ; Polish Literature ; Russian Literature ; Ukrainian Literature ; Theory of Literature ; Languages & Literatures
    ISSN: 0258-0802
    E-ISSN: 16481143
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