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M Baenitz - One of the best experts on this subject based on the ideXlab platform.

  • anisotropic ru3 4d5 magnetism in the α rucl3 honeycomb system susceptibility specific heat and zero field nmr
    Physical Review B, 2015
    Co-Authors: Mrinmoy Majumder, Alexander A Tsirlin, Hiroki Yasuoka, Helge Rosner, M Baenitz
    Abstract:

    Hexagonal alpha-Ru trichloride single crystals exhibit a strong magnetic anisotropy and we show that upon applying fields up to 14 T in the honeycomb plane the successive magnetic order at T1 = 14 K and T2 = 8 K could be completely suppressed whereas in the perpendicular direction the magnetic order is robust. Furthermore the field dependence of chi(T) implies coexisting ferro- and Antiferromagnetic Exchange between in-plane components of Ru^3+-spins, whereas for out-of-plane components a strong Antiferromagnetic Exchange becomes evident. 101^Ru zero-field nuclear magnetic resonance in the ordered state evidence a complex (probably non coplanar chiral) long-range magnetic structure. The large orbital moment on Ru^3+ is found in density-functional calculations.

  • anisotropic ru3 4d5 magnetism in the α rucl3 honeycomb system susceptibility specific heat and zero field nmr
    Physical Review B, 2015
    Co-Authors: Mrinmoy Majumder, Alexander A Tsirlin, Hiroki Yasuoka, Helge Rosner, M Schmidt, M Baenitz
    Abstract:

    Hexagonal $\ensuremath{\alpha}$-Ru trichloride single crystals exhibit a strong magnetic anisotropy and we show that upon applying fields up to 14 T in the honeycomb plane the successive magnetic order at ${T}_{1}=14\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ and ${T}_{2}=8\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ could be completely suppressed, whereas in the perpendicular direction the magnetic order is robust. Furthermore, the field dependence of $\ensuremath{\chi}(\mathrm{T})$ implies coexisting ferro- and Antiferromagnetic Exchange between in-plane components of ${\text{Ru}}^{3+}$ spins, whereas for out-of-plane components a strong Antiferromagnetic Exchange becomes evident. $^{101}\mathrm{Ru}$ zero-field nuclear magnetic resonance in the ordered state evidence a complex (probably noncoplanar chiral) long-range magnetic structure. The large orbital moment on ${\mathrm{Ru}}^{3+}$ is found in density-functional calculations.

Hong Ding - One of the best experts on this subject based on the ideXlab platform.

  • local Antiferromagnetic Exchange and collaborative fermi surface as key ingredients of high temperature superconductors
    Scientific Reports, 2012
    Co-Authors: Hong Ding
    Abstract:

    Cuprates, ferropnictides and ferrochalcogenides are three classes of unconventional high temperature superconductors, who share similar phase diagrams in which superconductivity develops after a magnetic order is suppressed, suggesting a strong interplay between superconductivity and magnetism, although the exact picture of this interplay remains elusive. Here we show that there is a direct bridge connecting Antiferromagnetic Exchange interactions determined in the parent compounds of these materials to the superconducting gap functions observed in the corresponding superconducting materials: in all high temperature superconductors, the Fermi surface topology matches the form factor of the pairing symmetry favored by local magnetic Exchange interactions. We suggest that this match offers a principle guide to search for new high temperature superconductors.

  • Local Antiferromagnetic Exchange and collaborative Fermi surface as key ingredients of high temperature superconductors
    Scientific Reports, 2012
    Co-Authors: Jiangping Hu, Hong Ding
    Abstract:

    Cuprates, ferropnictides and ferrochalcogenides are three classes of unconventional high-temperature superconductors, who share similar phase diagrams in which superconductivity develops after a magnetic order is suppressed, suggesting a strong interplay between superconductivity and magnetism, although the exact picture of this interplay remains elusive. Here we show that there is a direct bridge connecting Antiferromagnetic Exchange interactions determined in the parent compounds of these materials to the superconducting gap functions observed in the corresponding superconducting materials. High superconducting transition temperature is achieved when the Fermi surface topology matches the form factor of the pairing symmetry favored by local magnetic Exchange interactions. Our result offers a principle guide to search for new high temperature superconductors.

Mrinmoy Majumder - One of the best experts on this subject based on the ideXlab platform.

  • anisotropic ru3 4d5 magnetism in the α rucl3 honeycomb system susceptibility specific heat and zero field nmr
    Physical Review B, 2015
    Co-Authors: Mrinmoy Majumder, Alexander A Tsirlin, Hiroki Yasuoka, Helge Rosner, M Baenitz
    Abstract:

    Hexagonal alpha-Ru trichloride single crystals exhibit a strong magnetic anisotropy and we show that upon applying fields up to 14 T in the honeycomb plane the successive magnetic order at T1 = 14 K and T2 = 8 K could be completely suppressed whereas in the perpendicular direction the magnetic order is robust. Furthermore the field dependence of chi(T) implies coexisting ferro- and Antiferromagnetic Exchange between in-plane components of Ru^3+-spins, whereas for out-of-plane components a strong Antiferromagnetic Exchange becomes evident. 101^Ru zero-field nuclear magnetic resonance in the ordered state evidence a complex (probably non coplanar chiral) long-range magnetic structure. The large orbital moment on Ru^3+ is found in density-functional calculations.

  • anisotropic ru3 4d5 magnetism in the α rucl3 honeycomb system susceptibility specific heat and zero field nmr
    Physical Review B, 2015
    Co-Authors: Mrinmoy Majumder, Alexander A Tsirlin, Hiroki Yasuoka, Helge Rosner, M Schmidt, M Baenitz
    Abstract:

    Hexagonal $\ensuremath{\alpha}$-Ru trichloride single crystals exhibit a strong magnetic anisotropy and we show that upon applying fields up to 14 T in the honeycomb plane the successive magnetic order at ${T}_{1}=14\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ and ${T}_{2}=8\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ could be completely suppressed, whereas in the perpendicular direction the magnetic order is robust. Furthermore, the field dependence of $\ensuremath{\chi}(\mathrm{T})$ implies coexisting ferro- and Antiferromagnetic Exchange between in-plane components of ${\text{Ru}}^{3+}$ spins, whereas for out-of-plane components a strong Antiferromagnetic Exchange becomes evident. $^{101}\mathrm{Ru}$ zero-field nuclear magnetic resonance in the ordered state evidence a complex (probably noncoplanar chiral) long-range magnetic structure. The large orbital moment on ${\mathrm{Ru}}^{3+}$ is found in density-functional calculations.

Bruce Alvin Gurney - One of the best experts on this subject based on the ideXlab platform.

  • coherent magnetization rotation induced by optical modulation in ferromagnetic Antiferromagnetic Exchange coupled bilayers
    Physical Review B, 2000
    Co-Authors: Ganping Ju, Lu Chen, A V Nurmikko, R F C Farrow, R F Marks, M J Carey, Bruce Alvin Gurney
    Abstract:

    We have demonstrated recently that ultrafast ~;100 ps! coherent magnetization rotation can be induced by optical modulation of the Exchange coupling in an Exchange coupled bilayer ~NiFe/NiO! with short laser pulses @Phys. Rev. Lett. 82, 3705 ~1999!#. In this paper, we acquire further support of the coherent magnetization model by studying the details of magnetization switching dynamics, including the dependence on the amplitude of Exchange bias field. The Exchange bias field is subject to large transient modulation by femtosecond pulsed laser excitation, providing the impulsive force for subsequent magnetization dynamics. Good agreement is obtained with a simple model of coherent magnetization processes based on the Landau-Lifshitz-Gilbert equations of motion. We have also measured a strong dependence of the phenomenological damping constant ~a! on the Exchange bias in the coupled ferromagnetic/Antiferromagnetic spin system.

  • ultrafast time resolved photoinduced magnetization rotation in a ferromagnetic Antiferromagnetic Exchange coupled system
    Physical Review Letters, 1999
    Co-Authors: A V Nurmikko, R F C Farrow, R F Marks, M J Carey, Bruce Alvin Gurney
    Abstract:

    Ultrashort pulse laser techniques are applied to study optically induced modulation in Exchange biased ferromagnetic/Antiferromagnetic (FM/AF) thin bilayer films (NiFe/NiO). Photoexcitation of the FM/AF interface with subpicosecond laser pulses induces large modulation in the unidirectional Exchange bias field ( ${H}_{\mathrm{ex}}$) on an ultrashort time scale. The ``unpinning'' of the Exchange bias leads to coherent magnetization rotation in the permalloy film which is time resolved by the experiment and corresponds to a large modulation in the magnetization component ( $\ensuremath{\Delta}{M}_{Z}{/M}_{S}\ensuremath{\sim}0.5$), on a time scale of 100 psec.

Helge Rosner - One of the best experts on this subject based on the ideXlab platform.

  • anisotropic ru3 4d5 magnetism in the α rucl3 honeycomb system susceptibility specific heat and zero field nmr
    Physical Review B, 2015
    Co-Authors: Mrinmoy Majumder, Alexander A Tsirlin, Hiroki Yasuoka, Helge Rosner, M Baenitz
    Abstract:

    Hexagonal alpha-Ru trichloride single crystals exhibit a strong magnetic anisotropy and we show that upon applying fields up to 14 T in the honeycomb plane the successive magnetic order at T1 = 14 K and T2 = 8 K could be completely suppressed whereas in the perpendicular direction the magnetic order is robust. Furthermore the field dependence of chi(T) implies coexisting ferro- and Antiferromagnetic Exchange between in-plane components of Ru^3+-spins, whereas for out-of-plane components a strong Antiferromagnetic Exchange becomes evident. 101^Ru zero-field nuclear magnetic resonance in the ordered state evidence a complex (probably non coplanar chiral) long-range magnetic structure. The large orbital moment on Ru^3+ is found in density-functional calculations.

  • anisotropic ru3 4d5 magnetism in the α rucl3 honeycomb system susceptibility specific heat and zero field nmr
    Physical Review B, 2015
    Co-Authors: Mrinmoy Majumder, Alexander A Tsirlin, Hiroki Yasuoka, Helge Rosner, M Schmidt, M Baenitz
    Abstract:

    Hexagonal $\ensuremath{\alpha}$-Ru trichloride single crystals exhibit a strong magnetic anisotropy and we show that upon applying fields up to 14 T in the honeycomb plane the successive magnetic order at ${T}_{1}=14\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ and ${T}_{2}=8\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ could be completely suppressed, whereas in the perpendicular direction the magnetic order is robust. Furthermore, the field dependence of $\ensuremath{\chi}(\mathrm{T})$ implies coexisting ferro- and Antiferromagnetic Exchange between in-plane components of ${\text{Ru}}^{3+}$ spins, whereas for out-of-plane components a strong Antiferromagnetic Exchange becomes evident. $^{101}\mathrm{Ru}$ zero-field nuclear magnetic resonance in the ordered state evidence a complex (probably noncoplanar chiral) long-range magnetic structure. The large orbital moment on ${\mathrm{Ru}}^{3+}$ is found in density-functional calculations.