In situ photoemission study of the room temperature ferromagnet ZnGeP2:Mn.
The chemical states of the ZnGeP(2):Mn interface which shows ferromagnetism above room temperature have been studied by photoemission spectroscopy. Mn deposition on the ZnGeP2 substrate heated to 400 degrees C induced Mn substitution for Zn and then the formation of metallic Mn-Ge-P compounds. Depth profile studies have shown that Mn 3d electrons changed their character from itinerant to localized along the depth, and in the deep region, dilute divalent Mn species (<5% Mn) was observed with a coexisting metallic Fermi edge of non-Mn 3d character. The possibility of hole doping through Mn substitution for Ge and/or Zn vacancy is discussed.
Ishida
Y
Y
Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
Sarma
D D
DD
Okazaki
K
K
Okabayashi
J
J
Hwang
J I
JI
Ott
H
H
Fujimori
A
A
Medvedkin
G A
GA
Ishibashi
T
T
Sato
K
K