First research paper from the Sika

Prof W.F. Pong, from Tamkang University in Taiwan, along with collaborators from ANSTO and Osaka University in Japan, published the first research paper from the cold neutron, triple axis spectrometer, Sika.  

Just published in the Physical Review B, Prof. Pong used the neutron Spectrometer at OPAL to investigate the spatial spin-spin correlations and the spin relaxation processes in a single crystal of (Ni0.4Mn0.6)TiO3

The parent compounds of this solid solution are antiferromagnetic with orthogonal easy axes of magnetisation.  When mixed at this 40/60 ratio the long range magnetic order is supressed and a glassy magnetic groundstate is formed, possibly hosting magnetic texture, such as a skyrmion with possible technological applications for spintronics. 

Using Sika, the team worked on the dimensionality of the spin-spin correlations and the universality class of the spin system.  It was found that the spatial correlations are over three times greater in the plane than out, but the relaxation processes in the two directions were within experimental error of each other.

The full reference is “Correlations and dynamics of spins in an XY-like spin-glass (Ni0.4Mn0.6)TiOsingle crystal system”, R. S. Solanki, S. -H. Hsieh, C. H. Du, G. Deng, C. W. Wang, J. S. Gardner, H. Tonomoto, T. Kimura and W. F. Pong

Phys. Rev. B 95, 024425 (2017)


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