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Magnetic chiral skyrmion bubbles and achiral bubbles are two independentmagnetic domain structures, in which the former with equivalent winding numberto skyrmions offers great promise as information carriers for furtherspintronic devices. Here, in this work, we experimentally investigate thegeneration and annihilation of magnetic chiral skyrmion bubbles and achiralbubbles in the Mn-Ni-Ga thin plate by using the Lorentz transmission electronmicroscopy (L-TEM). The two independent magnetic domain structures can bedirectly controlled after the field cooling manipulation by varying the titledangles of external magnetic fields. By imaging the magnetization reversal withincreasing temperature, we found an extraordinary annihilation mode of magneticchiral skyrmion bubbles and a non-linear frequency for the winding numberreversal. Quantitative analysis of such dynamics was performed by using L-TEMto directly determine the barrier energy for the magnetization reversal ofmagnetic chiral skyrmion bubbles.

Thermally induced generation and annihilation of magnetic chiral skyrmion bubbles and achiral bubbles in Mn-Ni-Ga Magnets