Magnetic properties of Mn-doped ZnO diluted magnetic semiconductors |
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Authors: | Liu Xue-Chao Zhang Hua-Wei Zhang Tao Chen Bo-Yuan Chen Zhi-Zhan Song Li-Xin and Shi Er-Wei |
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Institution: | Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;Graduate School of the Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | A series of Mn-doped ZnO films have been prepared in different
sputtering plasmas by using the inductively coupled plasma enhanced
physical vapour deposition. The films show paramagnetic behaviour
when they are deposited in an argon plasma. The Hall measurement
indicates that ferromagnetism cannot be realized by increasing the
electron concentration. However, the room-temperature ferromagnetism
is obtained when the films are deposited in a mixed argon-nitrogen
plasma. The first-principles calculations reveal that
antiferromagnetic ordering is favoured in the case of the
substitution of Mn$^{2 + }$ for Zn$^{2 + }$ without additional
acceptor doping. The substitution of N for O (NMn-doped ZnO, diluted magnetic
semiconductors, first-principle calculationsProject supported by the Shanghai
Nanotechnology Promotion Center (Grant No 0452nm071) and the
National Natural Science Foundation of China (Grant Nos 50702071 and
50772122).7115A, 7550P, 7000A series of Mn-doped ZnO films have been prepared in different
sputtering plasmas by using the inductively coupled plasma enhanced
physical vapour deposition. The films show paramagnetic behaviour
when they are deposited in an argon plasma. The Hall measurement
indicates that ferromagnetism cannot be realized by increasing the
electron concentration. However, the room-temperature ferromagnetism
is obtained when the films are deposited in a mixed argon-nitrogen
plasma. The first-principles calculations reveal that
antiferromagnetic ordering is favoured in the case of the
substitution of Mn$^{2 + }$ for Zn$^{2 + }$ without additional
acceptor doping. The substitution of N for O (NMn-doped ZnO, diluted magnetic
semiconductors, first-principle calculationsProject supported by the Shanghai
Nanotechnology Promotion Center (Grant No 0452nm071) and the
National Natural Science Foundation of China (Grant Nos 50702071 and
50772122).7115A, 7550P, 7000A series of Mn-doped ZnO films have been prepared in different
sputtering plasmas by using the inductively coupled plasma enhanced
physical vapour deposition. The films show paramagnetic behaviour
when they are deposited in an argon plasma. The Hall measurement
indicates that ferromagnetism cannot be realized by increasing the
electron concentration. However, the room-temperature ferromagnetism
is obtained when the films are deposited in a mixed argon-nitrogen
plasma. The first-principles calculations reveal that
antiferromagnetic ordering is favoured in the case of the
substitution of Mn$^{2 + }$ for Zn$^{2 + }$ without additional
acceptor doping. The substitution of N for O (NMn-doped ZnO, diluted magnetic
semiconductors, first-principle calculationsProject supported by the Shanghai
Nanotechnology Promotion Center (Grant No 0452nm071) and the
National Natural Science Foundation of China (Grant Nos 50702071 and
50772122).7115A, 7550P, 7000A series of Mn-doped ZnO films have been prepared in different
sputtering plasmas by using the inductively coupled plasma enhanced
physical vapour deposition. The films show paramagnetic behaviour
when they are deposited in an argon plasma. The Hall measurement
indicates that ferromagnetism cannot be realized by increasing the
electron concentration. However, the room-temperature ferromagnetism
is obtained when the films are deposited in a mixed argon-nitrogen
plasma. The first-principles calculations reveal that
antiferromagnetic ordering is favoured in the case of the
substitution of Mn$^{2 + }$ for Zn$^{2 + }$ without additional
acceptor doping. The substitution of N for O (N$_{\rm O}^{ - })$ is
necessary to induce ferromagnetic couplings in the Zn-Mn-O system.
The hybridization between N 2p and Mn 3d provides an empty orbit
around the Fermi level. The hopping of Mn 3d electrons through the
empty orbit can induce the ferromagnetic coupling. The
ferromagnetism in the N-doped Zn-Mn-O system possibly originates
from the charge transfer between Mn$^{2 + }$ and Mn$^{3 + }$ via
N$_{\rm O}^{ - }$. The key factor is the empty orbit provided by
substituting N for O, rather than the conductivity type or the
carrier concentration. |
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Keywords: | Mn-doped ZnO diluted magnetic
semiconductors first-principle calculations |
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