  We introduce the concept of tunable ideal magnetic dipole scattering, where a
nonmagnetic nanoparticle scatters lights as a pure magnetic dipole. High
refractive index subwavelength nanoparticles usually support both electric and
magnetic dipole responses. Thus, to achieve ideal magnetic dipole scattering
one has to suppress the electric dipole response. Such a possibility was
recently demonstrated for the so-called anapole mode, which is associated with
zero electric dipole scattering. By overlapping magnetic dipole resonance with
the anapole mode we achieve ideal magnetic dipole scattering in the far-field
with tunable high scattering resonances in near infrared spectrum. We
demonstrate that such condition can be realized for two subwavelength
geometries. One of them is core-shell nanosphere consisting of Au core and
silicon shell. It can be also achieved in other geometries, including
nanodisks, which are compatible with current nanofabrication technology.
