Noncollinear Magnetic Structures in the Chiral Antiperovskite β-FeSeO.

We present the magnetic properties of the chiral, polar, and possibly magnetoelectric antiperovskite β-FeSeO as derived from magnetization and specific-heat measurements as well as from powder neutron diffraction and Mössbauer experiments. Our macroscopic data unambiguously reveal two magnetic phase transitions at ≈ 103 K and ≈ 78 K, while Rietveld analysis of neutron powder diffraction data reveals a noncollinear antiferromagnetic structure featuring magnetic moments in the - plane of the trigonal structure and a ferromagnetic moment along . The latter is allowed by symmetry between and , weakly visible in the magnetization data yet unresolvable microscopically.

Sperm-Particle Interactions and Their Prospects for Charge Mapping.

In this article, a procedure to investigate sperm charge distribution by electrostatic sperm-particle interactions is demonstrated. Differently chargedparticles are fabricated and their attachment distribution on the bovine sperm membrane is investigated. The sperm-particle attachment sites are observed using bright field and cryo-scanning electron microscopy combined with energy-dispersive X-ray analysis.