The exchange interaction in (Ga,Cr)N doped with oxygen impurities

Tatsuya Nakano; Masafumi Shirai; Yoshio Miura; Kazutaka Nagao

doi:10.1002/pssc.200672842

The exchange interaction in (Ga,Cr)N doped with oxygen impurities

Tatsuya Nakano, Masafumi Shirai, Yoshio Miura, Kazutaka Nagao

Information Devices Division

Research output: Contribution to journal › Conference article › peer-review

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Abstract

We have studied the effect of O impurities on exchange interactions between Cr spins in (Ga,Cr)N by means of first-principles calculations based on the density functional theory. Although the magnetic moment par Cr atom is enhanced, the magnitude of ferromagnetic exchange interaction between Cr spins is reduced by co-doping with O into (Ga,Cr)N. In particular, the reduction is remarkable when the doped O atom forms a Cr-O-Cr complex. On the other hand, the ferromagnetic exchange interaction is not reduced if the O atom is separated from Cr atoms in (Ga,Cr)N. Nitrogen vacancy (V_n) also has similar effects to O impurities. The formation energy of the Cr-O-Cr complex is lower than that of Cr-V_NCr, so that excessive O codoping could reduce the ferromagnetic interaction between Cr spins more seriously than the formation of N vacancies.

Original language	English
Pages (from-to)	4147-4150
Number of pages	4
Journal	Physica Status Solidi (C) Current Topics in Solid State Physics
Volume	3
Issue number	12
DOIs	https://doi.org/10.1002/pssc.200672842
Publication status	Published - 2006 Dec 1
Event	4th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors, PASPS-IV - Sendai, Japan Duration: 2006 Aug 15 → 2006 Aug 18

ASJC Scopus subject areas

Condensed Matter Physics

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title = "The exchange interaction in (Ga,Cr)N doped with oxygen impurities",

abstract = "We have studied the effect of O impurities on exchange interactions between Cr spins in (Ga,Cr)N by means of first-principles calculations based on the density functional theory. Although the magnetic moment par Cr atom is enhanced, the magnitude of ferromagnetic exchange interaction between Cr spins is reduced by co-doping with O into (Ga,Cr)N. In particular, the reduction is remarkable when the doped O atom forms a Cr-O-Cr complex. On the other hand, the ferromagnetic exchange interaction is not reduced if the O atom is separated from Cr atoms in (Ga,Cr)N. Nitrogen vacancy (Vn) also has similar effects to O impurities. The formation energy of the Cr-O-Cr complex is lower than that of Cr-VNCr, so that excessive O codoping could reduce the ferromagnetic interaction between Cr spins more seriously than the formation of N vacancies.",

author = "Tatsuya Nakano and Masafumi Shirai and Yoshio Miura and Kazutaka Nagao",

year = "2006",

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note = "4th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors, PASPS-IV ; Conference date: 15-08-2006 Through 18-08-2006",

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TY - JOUR

T1 - The exchange interaction in (Ga,Cr)N doped with oxygen impurities

AU - Nakano, Tatsuya

AU - Shirai, Masafumi

AU - Miura, Yoshio

AU - Nagao, Kazutaka

PY - 2006/12/1

Y1 - 2006/12/1

N2 - We have studied the effect of O impurities on exchange interactions between Cr spins in (Ga,Cr)N by means of first-principles calculations based on the density functional theory. Although the magnetic moment par Cr atom is enhanced, the magnitude of ferromagnetic exchange interaction between Cr spins is reduced by co-doping with O into (Ga,Cr)N. In particular, the reduction is remarkable when the doped O atom forms a Cr-O-Cr complex. On the other hand, the ferromagnetic exchange interaction is not reduced if the O atom is separated from Cr atoms in (Ga,Cr)N. Nitrogen vacancy (Vn) also has similar effects to O impurities. The formation energy of the Cr-O-Cr complex is lower than that of Cr-VNCr, so that excessive O codoping could reduce the ferromagnetic interaction between Cr spins more seriously than the formation of N vacancies.

AB - We have studied the effect of O impurities on exchange interactions between Cr spins in (Ga,Cr)N by means of first-principles calculations based on the density functional theory. Although the magnetic moment par Cr atom is enhanced, the magnitude of ferromagnetic exchange interaction between Cr spins is reduced by co-doping with O into (Ga,Cr)N. In particular, the reduction is remarkable when the doped O atom forms a Cr-O-Cr complex. On the other hand, the ferromagnetic exchange interaction is not reduced if the O atom is separated from Cr atoms in (Ga,Cr)N. Nitrogen vacancy (Vn) also has similar effects to O impurities. The formation energy of the Cr-O-Cr complex is lower than that of Cr-VNCr, so that excessive O codoping could reduce the ferromagnetic interaction between Cr spins more seriously than the formation of N vacancies.

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JO - Physica Status Solidi C: Conferences

JF - Physica Status Solidi C: Conferences

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T2 - 4th International Conference on Physics and Applications of Spin-related Phenomena in Semiconductors, PASPS-IV

Y2 - 15 August 2006 through 18 August 2006

ER -

The exchange interaction in (Ga,Cr)N doped with oxygen impurities

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