The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform

Mi Yan - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced Young's moduli and damping capacity in magnetically annealed Tb0.36Dy0.64(Fe0.85Co0.15)2 polycrystals
    Journal of Physics D: Applied Physics, 2009
    Co-Authors: Jingjing Zhang, Mi Yan
    Abstract:

    The magnetomechanical performance of ferromagnets is strongly sensitive to their initial magnetic states. In this work, magnetomechanical properties of the 1 1 0 oriented crystals Tb0.36Dy0.64(Fe0.85Co0.15)2 with different initial magnetic states induced by field annealing have been studied. Young's moduli and damping capacity were calculated from stress–strain curves taken by quasi-static measurements. The sample became 'harder' after Perpendicular magnetic annealing, possessing much larger Young's modulus than the untreated one. In addition, the maximum damping capacity ΔW/W for the magnetically annealed rod reached 1.176 at a stress magnitude of 21.2 MPa, both of which were higher than that of the untreated sample. The variation of Young's moduli and damping capacity can be explained by the magnetic domain switching process and movements of non-180° domain walls.

  • Stress influences on magnetization and magnetostriction in magnetically annealed Tb0.36Dy0.64(Fe0.85Co0.15)2 polycrystals
    Journal of Applied Physics, 2009
    Co-Authors: Mi Yan, Changsheng Zhang, Yongmao Pei, Chengbao Jiang
    Abstract:

    Magnetic annealing can reorient the domain moments, improving dramatically the magnetostriction of Tb–Dy–Fe oriented polycrystals without applying any prestress. In this paper, totally different stress dependences of magnetization and magnetostriction were observed in ⟨110⟩ oriented Tb0.36Dy0.64(Fe0.85Co0.15)2 polycrystals after Perpendicular magnetic annealing. Under compressive prestress, no obvious increase in magnetostriction occurred but the linear magnetostriction performance was improved. The magnetization initially decreased and approached to saturation at relatively higher magnetic fields with increasing the stress magnitude. Such variation can be contributed mainly by the redistribution of initial magnetic moments and enlargement of 71° wall energy.

Chengbao Jiang - One of the best experts on this subject based on the ideXlab platform.

  • Stress influences on magnetization and magnetostriction in magnetically annealed Tb0.36Dy0.64(Fe0.85Co0.15)2 polycrystals
    Journal of Applied Physics, 2009
    Co-Authors: Mi Yan, Changsheng Zhang, Yongmao Pei, Chengbao Jiang
    Abstract:

    Magnetic annealing can reorient the domain moments, improving dramatically the magnetostriction of Tb–Dy–Fe oriented polycrystals without applying any prestress. In this paper, totally different stress dependences of magnetization and magnetostriction were observed in ⟨110⟩ oriented Tb0.36Dy0.64(Fe0.85Co0.15)2 polycrystals after Perpendicular magnetic annealing. Under compressive prestress, no obvious increase in magnetostriction occurred but the linear magnetostriction performance was improved. The magnetization initially decreased and approached to saturation at relatively higher magnetic fields with increasing the stress magnitude. Such variation can be contributed mainly by the redistribution of initial magnetic moments and enlargement of 71° wall energy.

Yoshio Nakamura - One of the best experts on this subject based on the ideXlab platform.

  • Strong Perpendicular exchange bias in sputter-deposited CoPt/CoO multilayers
    Applied Physics Letters, 2013
    Co-Authors: J. Wang, Takumi Sannomiya, T. Omi, Shinji Muraishi, Ji Shi, Yoshio Nakamura
    Abstract:

    Strong Perpendicular exchange bias was realized in sputter-deposited CoPt/CoO multilayers. The as-deposited multilayer shows strong Perpendicular magnetic anisotropy (PMA) which remains up to a critical CoPt layer thickness as thick as 4 nm. after Perpendicular field cooling, the multilayer with antiferromagnetic CoO and ferromagnetic CoPt interfaces exhibits large Perpendicular exchange bias of 1730 Oe. Strong PMA in the CoPt/CoO multilayer is mainly attributed to the positive magnetoelastic energy due to the remarkable in-plane tensile stress originating from the local epitaxial growth. The mechanism for the exchange bias was explained in terms of the interfacial spin structure.

  • Perpendicular magnetic anisotropy and Perpendicular exchange bias in sputter-deposited CoO/CoPt multilayer
    Journal of Applied Physics, 2013
    Co-Authors: J. Wang, Takumi Sannomiya, Yoshio Nakamura
    Abstract:

    The structural and magnetic properties of room-temperature sputter-deposited CoO/CoPt multilayer have been investigated. It was found that the multilayers show strong Perpendicular magnetic anisotropy (PMA) at room temperature. Moreover, after Perpendicular field cooling below the Neel temperature of CoO layer, the multilayer with antiferromagnet (AF)/ferromagnet (FM) interfaces exhibits Perpendicular exchange bias (PEB). And also the PMA of the multilayer is enhanced after field cooling process. This is considered due to the strong interfacial exchange coupling between the CoPt and CoO layers, which is further confirmed from the significantly enhanced Perpendicular coercivity. Similar with the reported Co/noble-metal structures, the strong PMA found here also shows clear interface effect. However, with the multilayer structure studied here, the PMA can survive with relative thicker ferromagnetic layer (tFM ∼ 2.3 nm) at as-deposited state. Therefore, the PMA found in AF/FM multilayer could be partially at...

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

  • Strong Perpendicular exchange bias in sputter-deposited CoPt/CoO multilayers
    Applied Physics Letters, 2013
    Co-Authors: J. Wang, Takumi Sannomiya, T. Omi, Shinji Muraishi, Ji Shi, Yoshio Nakamura
    Abstract:

    Strong Perpendicular exchange bias was realized in sputter-deposited CoPt/CoO multilayers. The as-deposited multilayer shows strong Perpendicular magnetic anisotropy (PMA) which remains up to a critical CoPt layer thickness as thick as 4 nm. after Perpendicular field cooling, the multilayer with antiferromagnetic CoO and ferromagnetic CoPt interfaces exhibits large Perpendicular exchange bias of 1730 Oe. Strong PMA in the CoPt/CoO multilayer is mainly attributed to the positive magnetoelastic energy due to the remarkable in-plane tensile stress originating from the local epitaxial growth. The mechanism for the exchange bias was explained in terms of the interfacial spin structure.

  • Perpendicular magnetic anisotropy and Perpendicular exchange bias in sputter-deposited CoO/CoPt multilayer
    Journal of Applied Physics, 2013
    Co-Authors: J. Wang, Takumi Sannomiya, Yoshio Nakamura
    Abstract:

    The structural and magnetic properties of room-temperature sputter-deposited CoO/CoPt multilayer have been investigated. It was found that the multilayers show strong Perpendicular magnetic anisotropy (PMA) at room temperature. Moreover, after Perpendicular field cooling below the Neel temperature of CoO layer, the multilayer with antiferromagnet (AF)/ferromagnet (FM) interfaces exhibits Perpendicular exchange bias (PEB). And also the PMA of the multilayer is enhanced after field cooling process. This is considered due to the strong interfacial exchange coupling between the CoPt and CoO layers, which is further confirmed from the significantly enhanced Perpendicular coercivity. Similar with the reported Co/noble-metal structures, the strong PMA found here also shows clear interface effect. However, with the multilayer structure studied here, the PMA can survive with relative thicker ferromagnetic layer (tFM ∼ 2.3 nm) at as-deposited state. Therefore, the PMA found in AF/FM multilayer could be partially at...

Jingjing Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced Young's moduli and damping capacity in magnetically annealed Tb0.36Dy0.64(Fe0.85Co0.15)2 polycrystals
    Journal of Physics D: Applied Physics, 2009
    Co-Authors: Jingjing Zhang, Mi Yan
    Abstract:

    The magnetomechanical performance of ferromagnets is strongly sensitive to their initial magnetic states. In this work, magnetomechanical properties of the 1 1 0 oriented crystals Tb0.36Dy0.64(Fe0.85Co0.15)2 with different initial magnetic states induced by field annealing have been studied. Young's moduli and damping capacity were calculated from stress–strain curves taken by quasi-static measurements. The sample became 'harder' after Perpendicular magnetic annealing, possessing much larger Young's modulus than the untreated one. In addition, the maximum damping capacity ΔW/W for the magnetically annealed rod reached 1.176 at a stress magnitude of 21.2 MPa, both of which were higher than that of the untreated sample. The variation of Young's moduli and damping capacity can be explained by the magnetic domain switching process and movements of non-180° domain walls.