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'Relaxation' in keywords Facet   Publication Year 1996  [X]
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1Author    Ch Frommen, M. Mangold, J. PeblerRequires cookie*
 Title    Magnetic Solitons in the 1-D Antiferromagnetic Chains of Li 2 Mn 0 98 Fe 0 02 F 5 and Na 2 Mn 0 98 Fe 0 0 2 F 5  
 Abstract    Measurements of the 57 Fe Mössbauer effect and magnetic susceptibility have been performed on 57 Fe-doped quasi-l-d antiferromagnetic chains of Li 2 MnF 5 and Na 2 MnFg as a function of temper-ature. The Mössbauer spectra, fitted by the Blume-Tjon model, show definite relaxation effects near the Neel temperature, which are attributed to short-range order with temperature-dependent relax-ation times. The soliton model of non-linear excitations was applied. Experimental data confirm the predicted exponential temperature dependence of the thermal excitation of moving domain walls. From the activation energies E 2 Jk 2 as a function of 1-d exchange energies J/k the local anisotropy energy D/k of —3.7(2) K was derived on the basis of sine-Gordon theory. This result is in fair agreement with —3.5(1) K previously derived from magnetic susceptibility measurements. In the light of our results there is some evidence that at low bridging angle ß % 102(5)° a phase-transition from antiferromagnetic to ferromagnetic ordering occurs. 
  Reference    Z. Naturforsch. 51a, 939—949 (1996); received February 1 1996 
  Published    1996 
  Keywords    Magnetization Exchange and Anisotropy Energy, Relaxation, Solitons 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0939.pdf 
 Identifier    ZNA-1996-51a-0939 
 Volume    51