Room temperature superparamagnetism in rutile TiO2 quantum dots produced via ECR sputtering

被引：13

作者：

Solanki, Vanaraj ^{[1
]}

Mishra, I. ^{[1
]}

Joshi, S. R. ^{[1
]}

Mishra, P. ^{[1
]}

Dash, P. ^{[2
]}

Mishra, N. C. ^{[2
]}

Kanjilal, D. ^{[3
]}

Varma, Shikha ^{[1
]}

机构：

[1] Inst Phys, Bhubaneswar 751005, Orissa, India

[2] Utkal Univ, Bhubaneswar 751004, Orissa, India

[3] Inter Univ Accelerator Ctr, New Delhi 110067, India

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2015年 / 365卷

关键词：

AFM; SQUID; Quantum dots; Superparamagnetism; TiO2; MAGNETIC-PROPERTIES; THIN-FILMS; NANOPARTICLES; FERROMAGNETISM; TRANSITION;

D O I：

10.1016/j.nimb.2015.07.018

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Nanostructures (NS) have been fabricated on rutile TiO2(110) single crystal surfaces using Ar ion beam sputtering technique. Pronounced quantum confinement effects in TiO2 nanodots lead to reduction in optical reflectance and bandgap widening. Moreover, a direct correlation between the size of NS and magnetic behavior is observed. This suggests that the size of NS plays crucial role in the evolution of magnetic nature. Though the smallest (similar to 5 nm) NS display superparamagnetic (SPM) behavior, ferromagnetism is observed for larger nanostructures. Single domain nature of TiO2 quantum dots is responsible for the observed SPM behavior. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：82 / 85

页数：4

共 22 条

[1] Electronic depiction of magnetic origin in undoped and Fe doped TiO2-d epitaxial thin films [J].