Magnetic behavior of manganese-doped ZnSe quantum dots

被引：51

作者：

Lad, Amit D. ^{[1
]}

Rajesh, Ch.

Khan, Mahmud

Ali, Naushad

Gopalakrishnan, I. K.

Kulshreshtha, S. K.

Mahamuni, Shailaja

机构：

[1] Univ Pune, Dept Phys, Pune 411007, Maharashtra, India

[2] So Illinois Univ, Dept Phys, Carbondale, IL 62901 USA

[3] Bhabha Atom Res Ctr, Novel Mat & Struct Chem, Bombay 400085, Maharashtra, India

来源：

JOURNAL OF APPLIED PHYSICS | 2007年 / 101卷 / 10期

关键词：

D O I：

10.1063/1.2733625

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Magnetic properties of manganese-doped ZnSe quantum dots with the size of approximately 3.6 nm are investigated. The amount of Mn in the ZnSe quantum dots has been varied from 0.10% to 1.33%. The doping level in the quantum dots is much less than that used in the precursor. The co-ordination of Mn in the ZnSe lattice has been determined by electron paramagnetic resonance (EPR). Two different hyperfine couplings 67.3x10(-4) and 60.9x10(-4) cm(-1) observed in the EPR spectrum imply that Mn atoms occupy two distinct sites; one uncoordinated (near the surface) and other having a cubic symmetric environment (nanocrystal core), respectively. Photoluminescence measurements also confirm the incorporation of Mn in ZnSe quantum dots. From the Curie-Weiss behavior of the susceptibility, the effective Mn-Mn antiferromagnetic exchange constant (J(1)) has been evaluated. The spin-glass behavior is observed in 1.33% Mn-doped ZnSe quantum dots, at low temperature. Magnetic behavior at a low temperature is discussed. (c) 2007 American Institute of Physics.

引用

页数：5

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