A ferromagnetic/non-magnetic hybrid-double-quantum-disk (HDQD) structure formed in a nanorod is proposed, which is capable of manipulating the spatial profile of the carrier spins of the system by changing the longitudinal (perpendicular to the disks) external magnetic field. Synergy between size-asymmetrical disks and the difference of g-factors induces energy-level crossing and redistribution of the spin when the external magnetic field changes. The carrier's spin polarization profile is shown as well as the probability density change in the energy subband of each carrier. Characteristics of the structure can be applied to spin devices such as memory devices.