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Liu, Q,Zhu, X D,Wang, L H,Cheong, S-W,Tobey, R I IOP 2016 Journal of Physics, Condensed Matter Vol.28 No.19
<P>We measure magnetization and structural dynamics in two intercalant-ordered transition metal dichalcogenides: Fe<SUB>0.25</SUB>TaS<SUB>2</SUB> and Mn<SUB>0.25</SUB>TaS<SUB>2</SUB>. The structurally equivalent materials allow us to probe the effect of orbital angular momentum which is active in Fe<SUB>0.25</SUB>TaS<SUB>2</SUB> and absent in Mn<SUB>0.25</SUB>TaS<SUB>2</SUB>. Interestingly, we find that the magnetooptics dynamics are nearly indistinguishable in these two materials, in contradiction to conventional explanations of a spin–lattice mechanism. We compare our results to other materials where spin–lattice demagnetization has been put forth as a demagnetization channel.</P>
Danz, Th,Liu, Q,Zhu, X D,Wang, L H,Cheong, S W,Radu, I,Ropers, C,Tobey, R I IOP 2016 Journal of Physics, Condensed Matter Vol.28 No.35
<P>Free-standing thin films of magnetic ion intercalated transition metal dichalcogenides are produced using ultramicrotoming techniques. Films of thicknesses ranging from 30 nm to 250 nm were achieved and characterized using transmission electron diffraction and x-ray magnetic circular dichroism. Diffraction measurements visualize the long range crystallographic ordering of the intercalated ions, while the dichroism measurements directly assess the orbital contributions to the total magnetic moment. We thus verify the unquenched orbital moment in Fe<SUB>0.25</SUB>TaS<SUB>2</SUB> and measure the fully quenched orbital contribution in Mn<SUB>0.25</SUB>TaS<SUB>2</SUB>. Such films can be used in a wide variety of ultrafast x-ray and electron techniques that benefit from transmission geometries, and allow measurements of ultrafast structural, electronic, and magnetization dynamics in space and time.</P>