The invention relates to a continuous dry spinning process for preparing a fiber from a polymer solution having concentrations of polymer, salt, solvent and water. A substrate has a plurality of conductive regions is provided. The recording material being attracted by suction by a vacuum pump via suction grooves machined into the supporting surface and via suction ducts connected to the suction grooves. 001% to about 10% by weight of surfactant. The inventive compound can recognize a specific nucleotide sequence and can strongly bind to adjacent bases via covalent bonding, to regulate the expression of a DNA with the nucleotide sequence. The object is attained with a magnetic garnet single crystal represented by the chemical formula Bi\u03b1Na\u03b2M13-\u03b1-\u03b2Fe5-\u03b3M2\u03b3O12.