Investigating individual Fe50Co50 alloy nanoparticles using X-ray photo-emission electron microscopy

8th International Conference on Fine Particle Magnetism

Kleibert, A.^1 ; Balan, A.^1 ; Rodríguez, A Fraile^2 ; Nolting, F.^1

Swiss Light Source, Paul Scherrer Institut(PSI), Villigen, CH-5232, Switzerland^1

Departament de Física Fonamental, Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, E-08028 Barcelona, Spain^2

关键词: Alloy nanoparticle;    Chemical compositions;    Co-existence;    Magnetic dichroism;    Magnetic energies;    Mass-filtered;    Superparamagnetics;    X-ray-photo-emission electron microscopies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/521/1/012003/pdf
DOI  :  10.1088/1742-6596/521/1/012003

来源: IOP

【 摘 要 】

In situ X-ray photo-emission electron microscopy (PEEM) together with X-ray circular magnetic dichroism (XMCD) and complementary ex situ scanning electron microscopy (SEM) is used to investigate the properties of individual Fe50Co50 alloy nanoparticles in a mass-filtered particle ensemble with a mean size of 12 nm. The data reveal a uniform chemical composition of the particles, but a wide distribution of magnetic properties resulting in a co-existence of superparamagnetic (SPM) and ferromagnetically blocked particles. The ferromagnetic (FM) particles suggest enhanced magnetic energy barriers when compared to the magneto-crystalline anisotropy energy (MCA) of bulk Fe50Co50.