1：Experimental Design and Method Selection:

The study involved nanosecond laser ablation of a Ni target in double distilled water and ethanol, with and without an external magnetic field. The influence of different laser wavelengths (1064 nm, 532 nm, and 355 nm) on the characteristics of the ablated material was investigated.

2：Sample Selection and Data Sources:

A thin Ni plate (purity 99.99%) was used as the target, immersed in either double distilled water or ethanol.

3：99%) was used as the target, immersed in either double distilled water or ethanol. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: A nanosecond Nd: YAG laser was used for ablation, with a fused silica lens for focusing. A permanent magnet (B = 0.4 T) was applied for experiments involving an external magnetic field. Characterization was performed using Optical Microscopy, Scanning Electron Microscopy, Selected area electron diffraction, and Transmission Electron Microscopy.

4：4 T) was applied for experiments involving an external magnetic field. Characterization was performed using Optical Microscopy, Scanning Electron Microscopy, Selected area electron diffraction, and Transmission Electron Microscopy. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: The target was laser scanned using an XY translation stage. The laser fluence was varied, and the duration of the ablation process was 3 min for most experiments. For magnetic field-assisted experiments, a substrate was placed in the liquid to collect deposited material.

5：Data Analysis Methods:

The morphology, composition, and size distribution of the fabricated structures were analyzed using the aforementioned microscopy techniques. Dynamic light scattering (DLS) was also used to estimate the size distribution of particles in the colloidal solution.