Antiferromagnetic successive superexchange interactions underlying ferromagnetic couplings in codoped diluted magnetic semiconductors

被引:5
作者
Andriotis, Antonis N. [1 ]
Menon, Madhu [2 ]
机构
[1] FORTH, Inst Elect Struct & Laser, POB 1527, Iraklion 71110, Crete, Greece
[2] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA
关键词
first-principles calculations; molecular dynamics; magnetism; nanomaterials; ROOM-TEMPERATURE; DOPED ZNO;
D O I
10.1088/1361-648X/aada9d
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Our recent works have revealed that the magnetic coupling among the magnetic codopants in diluted magnetic semiconductors and doped transition metal oxides has a strong local feature. This was attributed to successive spin polarizations induced by the codopants to their neighboring anion ligands. In the present work, we analyze and refine the successive spin polarization based magnetic coupling using results of ab initio calculations and assign the magnetic coupling among the magnetic codopants to a combination of superexchange and double-exchange interactions. In particular, it is shown that antiferromagnetic successive superexchange interactions can lead to a ferromagnetic coupling between two magnetic dopants mediated by a suitable codopant with the latter forming a ferromagnetic double exchange coupling with its first nearest neighbor anions which couple it with the magnetic cations. This is exemplified by ab initio results for the magnetic coupling of two Co-dopants in the presence of a mediated Cu codopant in the environment of various hosts, namely ZnO, GaN, GaP, TiO2, CdS and SnO2. Additional results for other codopant pairs in various hosts are also presented.
引用
收藏
页数:6
相关论文
共 40 条
[11]   FERROMAGNETIC INTERMOLECULAR INTERACTION IN THE GALVINOXYL RADICAL - COOPERATION OF SPIN POLARIZATION AND CHARGE-TRANSFER INTERACTION [J].
AWAGA, K ;
SUGANO, T ;
KINOSHITA, M .
CHEMICAL PHYSICS LETTERS, 1987, 141 (06) :540-544
[12]   Two magnetic regimes in doped ZnO corresponding to a dilute magnetic semiconductor and a dilute magnetic insulator [J].
Behan, A. J. ;
Mokhtari, A. ;
Blythe, H. J. ;
Score, D. ;
Xu, X-H. ;
Neal, J. R. ;
Fox, A. M. ;
Gehring, G. A. .
PHYSICAL REVIEW LETTERS, 2008, 100 (04)
[13]   PROJECTOR AUGMENTED-WAVE METHOD [J].
BLOCHL, PE .
PHYSICAL REVIEW B, 1994, 50 (24) :17953-17979
[14]   Room temperature enhanced positive magnetoresistance in Pt and carrier induced Zn(Fe)O and Zn(Fe,Al)O dilute magnetic semiconductors junction [J].
Chattopadhyay, S. ;
Nath, T. K. .
JOURNAL OF APPLIED PHYSICS, 2010, 108 (08)
[15]   Donor impurity band exchange in dilute ferromagnetic oxides [J].
Coey, JMD ;
Venkatesan, M ;
Fitzgerald, CB .
NATURE MATERIALS, 2005, 4 (02) :173-179
[16]   Magnetization and Raman scattering studies of (Co,Mn) codoped ZnO nanoparticles [J].
Duan, L. B. ;
Rao, G. H. ;
Wang, Y. C. ;
Yu, J. ;
Wang, T. .
JOURNAL OF APPLIED PHYSICS, 2008, 104 (01)
[17]   Electron-energy-loss spectra and the structural stability of nickel oxide: An LSDA+U study [J].
Dudarev, SL ;
Botton, GA ;
Savrasov, SY ;
Humphreys, CJ ;
Sutton, AP .
PHYSICAL REVIEW B, 1998, 57 (03) :1505-1509
[18]   Energy band-gap engineering of graphene nanoribbons [J].
Han, Melinda Y. ;
Oezyilmaz, Barbaros ;
Zhang, Yuanbo ;
Kim, Philip .
PHYSICAL REVIEW LETTERS, 2007, 98 (20)
[19]   Surfactant-assisted synthesis of Co- and Li-doped ZnO nanocrystalline samples showing room-temperature ferromagnetism [J].
Jayakumar, Onattu D. ;
Gopalakrishnan, Iyyani K. ;
Kulshreshtha, Shadendra K. .
ADVANCED MATERIALS, 2006, 18 (14) :1857-+
[20]   MOBILITY OF ANTIFERROMAGNETIC LARGE POLARON [J].
KASUYA, T .
SOLID STATE COMMUNICATIONS, 1970, 8 (20) :1635-&