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

1 Citation (Scopus)

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

Access to Document

10.1002/pssc.200672842

Fingerprint Dive into the research topics of 'The exchange interaction in (Ga,Cr)N doped with oxygen impurities'. Together they form a unique fingerprint.

Cite this

@article{dbad7d0f64ed4a57b2d983d497ebacc6,

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",

month = dec,

day = "1",

doi = "10.1002/pssc.200672842",

language = "English",

volume = "3",

pages = "4147--4150",

journal = "Physica Status Solidi C: Conferences",

issn = "1862-6351",

publisher = "Wiley-VCH Verlag",

number = "12",

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",

}

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.

UR - http://www.scopus.com/inward/record.url?scp=34548696293&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34548696293&partnerID=8YFLogxK

U2 - 10.1002/pssc.200672842

DO - 10.1002/pssc.200672842

M3 - Conference article

AN - SCOPUS:34548696293

VL - 3

SP - 4147

EP - 4150

JO - Physica Status Solidi C: Conferences

JF - Physica Status Solidi C: Conferences

SN - 1862-6351

IS - 12

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 -