Unidirectional transport of superparamagnetic beads and biological cells along oval magnetic elements - Block, Findan; Klingbeil, Finn; Deshpande, Sughosh; Sajjad, Umer; Seidler, Dennis; Arndt, Christine; Sindt, Sandra; Selhuber-Unkel, Christine; McCord, Jeffrey (Applied physics letters, 2021)