Article

Dzyaloshinskii–Moriya interaction: How to measure its sign in weak ferromagnets?

JETP Letters (Impact Factor: 1.52). 01/2010; 92(6):383-387. DOI: 10.1134/S0021364010180050
Source: arXiv

ABSTRACT Three experimental techniques sensitive to the sign of the Dzyaloshinskii-Moriya interaction are discussed: neutron diffraction,
Mössbauer γ-ray diffraction, and resonant x-ray scattering. Classical examples of hematite (α-Fe2O3) and MnCO3 crystals are considered in detail.

0 Bookmarks
 · 
328 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The International Conference on Anomalous Scattering held in Malente, Germany, in 1992 examined the broad issue of ‘dispersion or resonant scattering’ for X-rays. The significant aspects discussed at that time included: the evaluation of X-ray scattering factors, the role of local broken symmetries and the application to structure determinations, the impact on magnetic X-ray scattering, but also resonant Raman scattering and nuclear resonant scattering. However, many aspects of resonant elastic X-ray scattering (REXS) were still being revealed and soon it was realised that new productive paths of research would open up. In the last two decades, applications have developed thanks to concurrent developments in X-ray instrumentation and theoretical approaches. Focusing on REXS only, noteworthy fields are: the observation of multiple order parameters, the detection of multipolar moments, but also applications in chemistry and materials sciences, macromolecules and soft matter in the soft X-ray range. REXS has evolved from the exploitation of large resonant signals to a powerful experimental and characterisation method aimed at unravelling new phenomena. The recent technical and theoretical advances have paved the way to further REXS developments in many fields of science.
    The European Physical Journal Special Topics 06/2012; 208(1). · 1.80 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The effect of spin-polarized current on the steady-state magnetization and oscillations of antiferromagnet magnetization in a ferromagnetic-antiferromagnetic magnetic junction is analyzed. The macrospin approximation is generalized to describe antiferromagnets. The canted configuration of the antiferromagnet and the resultant magnetic moment are produced by the application of an external magnetic field. The resonance frequency, damping, and threshold current density corresponding to the emergence of instability are calculated. The possibility of generating weakly damped magnetization oscillations in the terahertz range is demonstrated. The effect of fluctuations on the canted configuration of the antiferromagnet is discussed.
    Journal of Experimental and Theoretical Physics 02/2012; 114(2). · 0.92 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Experimental results and their theoretical explanation are reviewed for fundamentals of anisotropic resonant X-ray scattering. Resonant scattering depends on X-ray polarization, i.e. the scattering reflects anisotropic environment of atoms in crystal. The polarization anisotropy in atomic scattering can excite the forbidden Bragg reflections. Studying this type of forbidden reflections we can distinguish electronic orbitals of specific symmetry. This method is very useful for studying local electronic states in crystal. We reveal detailed property of the anisotropic scattering, effect of quadrupole transition, thermal motion, magnetic scattering and so on. Especially successful examples are given in detail: observation of phase of the scattering factor, the hybridization of states with different parity, local chirality of atom in centrosymmetric crystals, thermal-motion-induced resonant reflections, etc.
    The European Physical Journal Special Topics 208(1). · 1.80 Impact Factor

Full-text (3 Sources)

Download
51 Downloads
Available from
May 27, 2014