The optical control of magnetism offers an attractive possibility to manipulate small magnetic domains for prospective memory devices on ultrashort timescales. Here, we report on the local deterministic transformation of the magnetic domain pattern from stripes to bubbles in out-ofplane magnetized Co/Pt multilayers controlled only by the helicity of ultrashort laser pulses. Relying on the experimentally determined average size of stripe domains and the magnetic layer thickness, we calculate the temperature and characteristic fields at which the stripe-bubble transformation occurs. Furthermore, we demonstrate that in the narrow range of the laser power, the helicity induces a drag on domain walls.

中文翻译：

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从条纹到气泡：由激光螺旋引起的Co / Pt多层中磁畴图案的确定性转变

磁性的光学控制提供了极有吸引力的可能性，可以在超短时间尺度上为预期的存储设备操纵小磁畴。在这里，我们报道了仅由超短激光脉冲的螺旋度控制的平面外磁化Co / Pt多层中磁畴图案从条纹到气泡的局部确定性转换。依靠实验确定的条带区域的平均尺寸和磁性层厚度，我们计算发生条带-气泡转换的温度和特征场。此外，我们证明了在狭窄的激光功率范围内，螺旋线会在畴壁上产生阻力。