Spin Valve

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Christoph Stampfer - One of the best experts on this subject based on the ideXlab platform.

  • dry transferred cvd graphene for inverted Spin Valve devices
    Applied Physics Letters, 2017
    Co-Authors: Marc Drogeler, Luca Banszerus, Frank Volmer, Takashi Taniguchi, Kenji Watanabe, Bernd Beschoten, Christoph Stampfer
    Abstract:

    Integrating high-mobility graphene grown by chemical vapor deposition (CVD) into Spin transport devices is one of the key tasks in graphene Spintronics. We use a van der Waals pick-up technique to transfer CVD graphene by hexagonal boron nitride (hBN) from the copper growth substrate onto predefined Co/MgO electrodes to build inverted Spin Valve devices. Two approaches are presented: (i) a process where the CVD-graphene/hBN stack is first patterned into a bar and then transferred by a second larger hBN crystal onto Spin Valve electrodes and (ii) a direct transfer of a CVD-graphene/hBN stack. We report record high Spin lifetimes in CVD graphene of up to 1.75 ns at room temperature. Overall, the performances of our devices are comparable to devices fabricated from exfoliated graphene also revealing nanosecond Spin lifetimes. We expect that our dry transfer methods pave the way towards more advanced device geometries not only for Spintronic applications but also for CVD-graphene-based nanoelectronic devices ...

  • dry transferred cvd graphene for inverted Spin Valve devices
    arXiv: Mesoscale and Nanoscale Physics, 2017
    Co-Authors: Marc Drogeler, Luca Banszerus, Frank Volmer, Takashi Taniguchi, Kenji Watanabe, Bernd Beschoten, Christoph Stampfer
    Abstract:

    Integrating high-mobility graphene grown by chemical vapor deposition (CVD) into Spin transport devices is one of the key tasks in graphene Spintronics. We use a van der Waals pickup technique to transfer CVD graphene by hexagonal boron nitride (hBN) from the copper growth substrate onto predefined Co/MgO electrodes to build inverted Spin Valve devices. Two approaches are presented: (i) a process where the CVD-graphene/hBN stack is first patterned into a bar and then transferred by a second larger hBN crystal onto Spin Valve electrodes and (ii) a direct transfer of a CVD-graphene/hBN stack. We report record high Spin lifetimes in CVD graphene of up to 1.75 ns at room temperature. Overall, the performances of our devices are comparable to devices fabricated from exfoliated graphene also revealing nanosecond Spin lifetimes. We expect that our dry transfer methods pave the way towards more advanced device geometries not only for Spintronic applications but also for CVD-graphene-based nanoelectronic devices in general where patterning of the CVD graphene is required prior to the assembly of final van der Waals heterostructures.

B Buchner - One of the best experts on this subject based on the ideXlab platform.

  • The superconducting Spin Valve and triplet superconductivity
    Journal of Magnetism and Magnetic Materials, 2015
    Co-Authors: I. A. Garifullin, P V Leksin, Ya V Fominov, J Schumann, Yulia Krupskaya, V Kataev, Oliver G Schmidt, A. A. Kamashev, N.n. Garif׳yanov, B Buchner
    Abstract:

    A review of recent works on Spin Valves is presented. A number of CoO/Fe1/Cu/Fe2/S multilayers (S = In or Pb) are prepared and studied in detail. The full Spin-Valve effect for the superconducting current in these heterostructures is realized for the first time; its sign-changing oscillatory behavior is observed, depending on the thickness of the Fe2 layer; and direct evidence of long-range triplet superconductivity is found.

  • Superconducting Spin Valve and triplet superconductivity
    Bulletin of the Russian Academy of Sciences: Physics, 2014
    Co-Authors: I. A. Garifullin, P V Leksin, Ya V Fominov, J Schumann, V Kataev, N. N. Garif’yanov, A. A. Kamashev, B Buchner
    Abstract:

    A review of recent works on Spin Valves is presented. A number of CoO/Fe1/Cu/Fe2/S multilayers (S = In or Pb) are prepared and studied in detail. The full Spin-Valve effect for the superconducting current in these heterostructures is realized for the first time; its sign-changing oscillatory behavior is observed, depending on the thickness of the Fe2 layer; and direct evidence of long-range triplet superconductivity is found.

  • evidence for triplet superconductivity in a superconductor ferromagnet Spin Valve
    Physical Review Letters, 2012
    Co-Authors: P V Leksin, I. A. Garifullin, N N Garifyanov, Ya V Fominov, J Schumann, Yulia Krupskaya, V Kataev, Oliver G Schmidt, B Buchner
    Abstract:

    We have studied the dependence of the superconducting (SC) transition temperature on the mutual orientation of magnetizations of Fe1 and Fe2 layers in the Spin Valve system CoO(x)/Fe1/Cu/Fe2/Pb. We find that this dependence is nonmonotonic when passing from the parallel to the antiparallel case and reveals a distinct minimum near the orthogonal configuration. The analysis of the data in the framework of the SC triplet Spin Valve theory gives direct evidence for the long-range triplet superconductivity arising due to noncollinearity of the two magnetizations.

J.c. Lodder - One of the best experts on this subject based on the ideXlab platform.

  • Spin Valve transistors with high magnetocurrent and 40 μa output current
    Journal of Applied Physics, 2004
    Co-Authors: R. Jansen, O.m.j. Van 't Erve, H Gokcan, F M Postma, J.c. Lodder
    Abstract:

    The electrical characteristics of silicon-based Spin-Valve transistors are reported, focusing on how the output current and magnetocurrent depend on the magnitude of the emitter current. Transistors with a different combination of Schottky barriers ~Si/Au and Si/Cu! were used. The collector current rapidly increases with emitter current, without significant loss of magnetocurrent. Spin-Valve transistors with magnetocurrent around 400% and high output current up to 40 mA are obtained.

  • Fabrication technology for miniaturization of the Spin-Valve transistor
    Sensors and Actuators A-physical, 2001
    Co-Authors: Sungdong Kim, P. S. Anil Kumar, O.m.j. Van 't Erve, R. Vlutters, R. Jansen, J.c. Lodder
    Abstract:

    A new fabrication technology that allows miniaturization of the Spin-Valve transistor is presented. The Spin-Valve transistor consists of a Spin-Valve base (Pt 2 nm/NiFe 3 nm/Au 3.5 nm/Co 3 nm/Au 4 nm) sandwiched between a Si emitter and collector. With the use of a silicon-on-insulator wafer and vacuum metal bonding, Spin-Valve transistors down to a few tens of micron size are realized through conventional photolithography and etching processes. These Spin-Valve transistors show 275% magnetocurrent at 87 K and 170% at room temperature in small magnetic fields.

  • Noise properties of the Spin-Valve transistor
    Sensors and Actuators A-physical, 2001
    Co-Authors: O.m.j. Van 't Erve, P. S. Anil Kumar, J.c. Lodder, R. Vlutters, R. Jansen, Sungdong Kim, A.a. Smits, W. J. M. De Jonge
    Abstract:

    Noise measurements have been performed on a Spin-Valve transistor. This transistor consists of a Pt/NiFe/Au/Co/Au multilayer sandwiched between two semiconductors. For comparison, we also studied metal base transistors with a Pt/Au or Pt/NiFe/Au base. All samples show full shot noise in the collector current. The inclusion of a Spin-Valve in the base layer decreases the absolute value of the collector current and with it the noise level but it does not change the nature of the noise in this device. Similarly, the collector current, and therefore, the noise changes as a function of magnetic field for the Spin-Valve transistor, but no additional noise of magnetic origin is observed.

  • A highly sensitive Spin-Valve transistor
    Magnetic Storage Systems Beyond 2000, 2001
    Co-Authors: O.m.j. Van 't Erve, P. S. Anil Kumar, R. Vlutters, S.d. Kim, R. Jansen, J.c. Lodder
    Abstract:

    In this paper we present a Spin-Valve transistor made with a silicon on insulator wafer as emitter and a double sided polished Si wafer as collector. Using vacuum metal bonding we obtain a three terminal device in which a Spin-Valve layer is sandwiched between two Si wafers. We measure a 217% change in the collector current with magnetic field using a Spin Valve that shows only 0.5% resistance change in a current in plane measurement.

  • 300% magnetocurrent in a room temperature operating Spin-Valve transistor
    Physica C: Superconductivity, 2001
    Co-Authors: P.s. Anil Kumar, R. Vlutters, S.d. Kim, R. Jansen, O.m.j. Van’t Erve, J.c. Lodder
    Abstract:

    Here we present the realization of a room temperature operating Spin-Valve transistor with huge magnetocurrent (MC=300%) at low fields. This Spin-Valve transistor employs hot-electron transport across a Ni81Fe19/Au/Co Spin Valve. Hot electrons are injected into the Spin Valve across a Si–Pt Schottky barrier. After traversing the Spin Valve, these hot electrons are collected using a second Schottky barrier (Si–Au), which provides energy and momentum selection. The collector current is found to be extremely sensitive to the Spin-dependent scattering of hot electrons in the Spin Valve, and therefore on the applied magnetic field. We also illustrate the role of the collector diode characteristics in determining the magnetocurrent under collector bias

Ya V Fominov - One of the best experts on this subject based on the ideXlab platform.

  • The superconducting Spin Valve and triplet superconductivity
    Journal of Magnetism and Magnetic Materials, 2015
    Co-Authors: I. A. Garifullin, P V Leksin, Ya V Fominov, J Schumann, Yulia Krupskaya, V Kataev, Oliver G Schmidt, A. A. Kamashev, N.n. Garif׳yanov, B Buchner
    Abstract:

    A review of recent works on Spin Valves is presented. A number of CoO/Fe1/Cu/Fe2/S multilayers (S = In or Pb) are prepared and studied in detail. The full Spin-Valve effect for the superconducting current in these heterostructures is realized for the first time; its sign-changing oscillatory behavior is observed, depending on the thickness of the Fe2 layer; and direct evidence of long-range triplet superconductivity is found.

  • Superconducting Spin Valve and triplet superconductivity
    Bulletin of the Russian Academy of Sciences: Physics, 2014
    Co-Authors: I. A. Garifullin, P V Leksin, Ya V Fominov, J Schumann, V Kataev, N. N. Garif’yanov, A. A. Kamashev, B Buchner
    Abstract:

    A review of recent works on Spin Valves is presented. A number of CoO/Fe1/Cu/Fe2/S multilayers (S = In or Pb) are prepared and studied in detail. The full Spin-Valve effect for the superconducting current in these heterostructures is realized for the first time; its sign-changing oscillatory behavior is observed, depending on the thickness of the Fe2 layer; and direct evidence of long-range triplet superconductivity is found.

  • evidence for triplet superconductivity in a superconductor ferromagnet Spin Valve
    Physical Review Letters, 2012
    Co-Authors: P V Leksin, I. A. Garifullin, N N Garifyanov, Ya V Fominov, J Schumann, Yulia Krupskaya, V Kataev, Oliver G Schmidt, B Buchner
    Abstract:

    We have studied the dependence of the superconducting (SC) transition temperature on the mutual orientation of magnetizations of Fe1 and Fe2 layers in the Spin Valve system CoO(x)/Fe1/Cu/Fe2/Pb. We find that this dependence is nonmonotonic when passing from the parallel to the antiparallel case and reveals a distinct minimum near the orthogonal configuration. The analysis of the data in the framework of the SC triplet Spin Valve theory gives direct evidence for the long-range triplet superconductivity arising due to noncollinearity of the two magnetizations.

I. A. Garifullin - One of the best experts on this subject based on the ideXlab platform.

  • Superconducting Spin-Valve and triplet superconductivity
    JETP Letters, 2017
    Co-Authors: I. A. Garifullin
    Abstract:

    Recent experimental results on the superconducting Spin-Valve effect and generation of the long-range triplet superconductivity in a F1/F2/S structure are reviewed (here, F1 and F2 are uncoupled ferromagnetic layers, and S is the superconducting layer). The main results are the following: (i) the maximum of the magnitude of the superconducting Spin-Valve effect increases with decreasing the exchange field h in the ferromagnetic layer; (ii) a full switching between the normal and superconducting states may be realized with the aid of the triplet contribution to the Spin-Valve effect.

  • The superconducting Spin Valve and triplet superconductivity
    Journal of Magnetism and Magnetic Materials, 2015
    Co-Authors: I. A. Garifullin, P V Leksin, Ya V Fominov, J Schumann, Yulia Krupskaya, V Kataev, Oliver G Schmidt, A. A. Kamashev, N.n. Garif׳yanov, B Buchner
    Abstract:

    A review of recent works on Spin Valves is presented. A number of CoO/Fe1/Cu/Fe2/S multilayers (S = In or Pb) are prepared and studied in detail. The full Spin-Valve effect for the superconducting current in these heterostructures is realized for the first time; its sign-changing oscillatory behavior is observed, depending on the thickness of the Fe2 layer; and direct evidence of long-range triplet superconductivity is found.

  • Superconducting Spin Valve and triplet superconductivity
    Bulletin of the Russian Academy of Sciences: Physics, 2014
    Co-Authors: I. A. Garifullin, P V Leksin, Ya V Fominov, J Schumann, V Kataev, N. N. Garif’yanov, A. A. Kamashev, B Buchner
    Abstract:

    A review of recent works on Spin Valves is presented. A number of CoO/Fe1/Cu/Fe2/S multilayers (S = In or Pb) are prepared and studied in detail. The full Spin-Valve effect for the superconducting current in these heterostructures is realized for the first time; its sign-changing oscillatory behavior is observed, depending on the thickness of the Fe2 layer; and direct evidence of long-range triplet superconductivity is found.

  • evidence for triplet superconductivity in a superconductor ferromagnet Spin Valve
    Physical Review Letters, 2012
    Co-Authors: P V Leksin, I. A. Garifullin, N N Garifyanov, Ya V Fominov, J Schumann, Yulia Krupskaya, V Kataev, Oliver G Schmidt, B Buchner
    Abstract:

    We have studied the dependence of the superconducting (SC) transition temperature on the mutual orientation of magnetizations of Fe1 and Fe2 layers in the Spin Valve system CoO(x)/Fe1/Cu/Fe2/Pb. We find that this dependence is nonmonotonic when passing from the parallel to the antiparallel case and reveals a distinct minimum near the orthogonal configuration. The analysis of the data in the framework of the SC triplet Spin Valve theory gives direct evidence for the long-range triplet superconductivity arising due to noncollinearity of the two magnetizations.

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