A device (124, 125, 126, 127) for separating biological entities comprising: a soft magnetic center pole having a bottom end and a tapered tip end; first and second soft magnetic side poles (112, 113) disposed on opposite sides of the soft magnetic center pole and respectively having first and second bottom ends (1122, 1132), the first and second soft magnetic side poles (112, 113) respectively having first and second top ends (1121, 1131) that are bent towards the soft magnetic center pole and are positioned above the tapered tip end; a channel (201, 301) for receiving a sample fluid containing the biological entities for separation, the channel (201, 301) being disposed in a gap formed between the tapered tip end, the first top end, and the second top end; and one or more magnetic source(s) (109, 115, 116, 1092, 1094), wherein: a first magnetic source (109, 115, 116) of the one or more magnetic source(s) (109, 115, 116, 1092, 1094) is connected to the bottom end of the soft magnetic center pole the bottom end of the first soft magnetic side pole is connected to a magnetic source (109, 115, 116, 1092, 1094) of the one or more magnetic sources (109, 115, 116, 1092, 1094); the bottom end of the second soft magnetic side pole is connected to a magnetic source (109, 115, 116, 1092, 1094) of the one or more magnetic sources (109, 115, 116, 1092, 1094); and a magnetic flux (1048,1049) is thereby generated in the soft magnetic center pole and the first and second soft magnetic side poles (112, 113). a soft magnetic center pole having a bottom end and a tapered tip end; first and second soft magnetic side poles (112, 113) disposed on opposite sides of the soft magnetic center pole and respectively having first and second bottom ends (1122, 1132), the first and second soft magnetic side poles (112, 113) respectively having first and second top ends (1121, 1131) that are bent towards the soft magnetic center pole and are positioned above the tapered tip end; a channel (201, 301) for receiving a sample fluid containing the biological entities for separation, the channel (201, 301) being disposed in a gap formed between the tapered tip end, the first top end, and the second top end; and one or more magnetic source(s) (109, 115, 116, 1092, 1094), wherein: a first magnetic source (109, 115, 116) of the one or more magnetic source(s) (109, 115, 116, 1092, 1094) is connected to the bottom end of the soft magnetic center pole the bottom end of the first soft magnetic side pole is connected to a magnetic source (109, 115, 116, 1092, 1094) of the one or more magnetic sources (109, 115, 116, 1092, 1094); the bottom end of the second soft magnetic side pole is connected to a magnetic source (109, 115, 116, 1092, 1094) of the one or more magnetic sources (109, 115, 116, 1092, 1094); and a magnetic flux (1048,1049) is thereby generated in the soft magnetic center pole and the first and second soft magnetic side poles (112, 113). a first magnetic source (109, 115, 116) of the one or more magnetic source(s) (109, 115, 116, 1092, 1094) is connected to the bottom end of the soft magnetic center pole the bottom end of the first soft magnetic side pole is connected to a magnetic source (109, 115, 116, 1092, 1094) of the one or more magnetic sources (109, 115, 116, 1092, 1094); the bottom end of the second soft magnetic side pole is connected to a magnetic source (109, 115, 116, 1092, 1094) of the one or more magnetic sources (109, 115, 116, 1092, 1094); and a magnetic flux (1048,1049) is thereby generated in the soft magnetic center pole and the first and second soft magnetic side poles (112, 113).