Effect of Ar ion irradiation on the room temperature ferromagnetism of undoped and Cu-doped rutile TiO
2
single crystals
Xu Nan-Nan
1
, Li Gong-Ping
1, 2, †,
, Lin Qiao-Lu
1
, Liu Huan
1
, Bao Liang-Man
3
Micro-Raman spectra of the four SCs. Note that all curves shown here were normalized for comparison.