Biomedical applications, COMSOL modeling, Magnetic compo-sites, Magnetic multilayers, Magnetic nanomaterials, Magnetic particles, Magnetoimpedance, Stray fields, magnetic composites, SENSITIVE ELEMENT, magnetic nanomaterials, magnetic multilayers, DOMAIN-STRUCTURE, magnetic particles, NANOPARTICLES, biomedical applications, IMPEDANCE, stray fields, BIOSENSOR, magnetoimpedance