Growth and magnetic properties of MnO2−delta nanowire microspheres

TL;DR

This paper reports the synthesis of MnO2−delta microspheres composed of nanowires, analyzes their magnetic properties, and finds a parasitic ferromagnetic component likely caused by oxygen vacancies, with a transition around 13 K.

Contribution

It introduces a synthesis method for MnO2−delta microspheres with nanowire structures and characterizes their magnetic behavior, highlighting the effects of oxygen vacancies.

Findings

Microspheres consist of nanowires 20-50 nm in diameter and 2-8 μm long.

Oxygen vacancy delta estimated at 0.3 from XPS.

Magnetic transition observed at about 13 K, with a parasitic ferromagnetic component.

Abstract

We report the synthesis of MnO2−delta microspheres using hydrothermal and conventional chemical reaction methods. The microspheres of MnO2−delta consist of nanowires having a diameter of 20-50 nm and a length of 2-8 micro m. The value of the oxygen vacancy delta estimated from the x-ray photoelectron spectrum (XPS) is 0.3. The magnetization versus temperature curve indicates a magnetic transition at about 13 K. It is found that a parasitic ferromagnetic component is imposed on the antiferromagnetic structure of MnO2−delta, which might result from distortion of the lattice structure due to oxygen vacancies. The magnetic transition temperature TN is about 10 K lower than that of the bulk MnO2 single crystal.