Observation of MnP magnetic clusters in room-temperature ferromagnetic semiconductor Zn[sub 1-x]Mn[sub x]GeP[sub 2] using nuclear magnetic resonance

Taesoon Hwang; Jeong Hyun Shim; Soonchil Lee
September 2003
Applied Physics Letters;9/1/2003, Vol. 83 Issue 9, p1809
Academic Journal
We investigated chalcopyrite Zn[sub 1-x]Mn[sub x]GeP[sub 2] polycrystals, which have been reported as a room-temperature ferromagnetic semiconductor, with Mn concentrations of x=0.08 and 0.15 using [sup 55]Mn and [sup 31]P nuclear magnetic resonance spectroscopy. The samples were made by the same process and showed the same crystallographic and magnetic behavior as in the previous report, but the experimental results indicated that more than 90% of Mn atoms were in a MnP impurity phase and the MnP cluster size was tens of nanometers. No evidence of Mn atom substitution in the host ZnGeP[sub 2] lattice was observed and the magnetic property of Zn[sub 1-x]Mn[sub x]GeP[sub 2] was determined to be that of the MnP magnetic clusters, at least in the bulk. The inconsistency of the conclusions with x-ray diffraction data is a result of the weak crystallinity of MnP phase. © 2003 American Institute of Physics.


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