Device for the manipulation of magnetic particles in suspension comprising: a substrate; a magnetic conduit (100, 200, 300, 400, 500, 600, 700) suitable for the creation, movement and annihilation of domain walls (HH, TT), said magnetic conduit (100, 200, 300, 400, 500, 600, 700) being placed on said substrate; a magnetic particles suspension placed in proximity of the surface of said magnetic conduit (100, 200, 300, 400, 500, 600, 700); characterized in that: said magnetic conduit (100, 200, 300, 400, 500, 600, 700) comprises a strip of magnetic material so that said magnetic particles can be trapped, moved and released along said strip as a consequence of the creation, movement and annihilation of said domain walls along said strip and of the interaction between said domain walls (HH, TT) and said magnetic particles, wherein said strip comprises a plurality of adjacent segments (202b, 203A1, 203An, 204, 302, 303A1, 303An, 304, 303A2(n-1), 303A2n, 303B1, 303Bn, 402, 403A1, 403An, 404, 602, 603, 604) and the length of said segments is substantially larger than the transversal dimensions (width and thickness) of said segments (202, 203A1, 203An, 204, 302, 303A1, 303An, 304, 303A2(n-1), 303A2n, 303B1, 303Bn, 402, 403A1, 403An, 404, 602, 603, 604) so that said domain walls (HH, TT) are constrained domain walls transversally placed with respect to said strip and maintain their integrity during the movement. a substrate; a magnetic conduit (100, 200, 300, 400, 500, 600, 700) suitable for the creation, movement and annihilation of domain walls (HH, TT), said magnetic conduit (100, 200, 300, 400, 500, 600, 700) being placed on said substrate; a magnetic particles suspension placed in proximity of the surface of said magnetic conduit (100, 200, 300, 400, 500, 600, 700); characterized in that: said magnetic conduit (100, 200, 300, 400, 500, 600, 700) comprises a strip of magnetic material so that said magnetic particles can be trapped, moved and released along said strip as a consequence of the creation, movement and annihilation of said domain walls along said strip and of the interaction between said domain walls (HH, TT) and said magnetic particles, wherein said strip comprises a plurality of adjacent segments (202b, 203A1, 203An, 204, 302, 303A1, 303An, 304, 303A2(n-1), 303A2n, 303B1, 303Bn, 402, 403A1, 403An, 404, 602, 603, 604) and the length of said segments is substantially larger than the transversal dimensions (width and thickness) of said segments (202, 203A1, 203An, 204, 302, 303A1, 303An, 304, 303A2(n-1), 303A2n, 303B1, 303Bn, 402, 403A1, 403An, 404, 602, 603, 604) so that said domain walls (HH, TT) are constrained domain walls transversally placed with respect to said strip and maintain their integrity during the movement. said magnetic conduit (100, 200, 300, 400, 500, 600, 700) comprises a strip of magnetic material so that said magnetic particles can be trapped, moved and released along said strip as a consequence of the creation, movement and annihilation of said domain walls along said strip and of the interaction between said domain walls (HH, TT) and said magnetic particles, wherein said strip comprises a plurality of adjacent segments (202b, 203A1, 203An, 204, 302, 303A1, 303An, 304, 303A2(n-1), 303A2n, 303B1, 303Bn, 402, 403A1, 403An, 404, 602, 603, 604) and the length of said segments is substantially larger than the transversal dimensions (width and thickness) of said segments (202, 203A1, 203An, 204, 302, 303A1, 303An, 304, 303A2(n-1), 303A2n, 303B1, 303Bn, 402, 403A1, 403An, 404, 602, 603, 604) so that said domain walls (HH, TT) are constrained domain walls transversally placed with respect to said strip and maintain their integrity during the movement.