Neutron diffraction and magnetism of CoO antiferromagnetic nanoparticles

abstract

We report a study on neutron diffraction and magnetic properties of cobalt oxide CoO antiferromagnetic nanoparticles with different sizes. The nanoparticles are composed by a structurally and magnetically ordered core and a structurally ordered and magnetically disordered shell with a thickness of about 2 nm. The ordered core has cell parameters, moments direction and modulus similar to those of bulk CoO. Small differences found are attributed to an increase of the oxidation of the nanoparticles with the decrease of size. A remanent moment M-r can be induced in CoO nanoparticles by crossing the transition temperature in the presence of a magnetic field, while the magnetic structure of the antiferromagnetically ordered moments of then a noparticles core remains unchanged after field cooling within the experimental precision, suggesting that M-r arises in the magnetically disordered shell.

keywords

MAGNETIZATION; TEMPERATURE

subject category

Materials Science; Physics

authors

Silva, NJO; Puente-Orench, I; Martins, M; Trindade, T; Millan, A; Campo, J; Palacio, F

our authors

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".