### Supplementary Materials

### Additional Files

## Supplementary Materials

**The PDF file includes:**- Fig. S1. Occurrence frequency distribution of femtosecond laser pulse–induced magnetic
structures in a circular Py disk at a fluence of 16 mJ/cm
^{2}. - Fig. S2. Occurrence frequency distribution of femtosecond laser pulse–induced magnetic
structures in a square Py disk at a fluence of 16 mJ/cm
^{2}. - Fig. S3. Occurrence frequency distribution of femtosecond laser pulse–induced magnetic
structures in a triangular Py disk at a fluence of 16 mJ/cm
^{2}. - Fig. S4. Schematic of relative change to the sum of demagnetization and exchange energies
associated with the transformation of the indicated state to a lower-energy state
estimated by application of a magnetic field applied along the ±
*x*or ±*y*directions, whichever is lowest. - Fig. S5. Typical magnetic structures in triangular Py disks (edge length of 1.7 μm) determined by micromagnetic simulation to show the pinning sites at the disk edge.
- Fig. S6. Annular bright-field images of a circular Py disk after a femtosecond laser pulse quenching with different fluences to show the change of the inside crystallites.
- Legends for movies S1 to S13

**Other Supplementary Material for this manuscript includes the following:**- Movie S1 (.avi format). Fresnel imaging of femtosecond laser pulse quenching–induced magnetic
structure change in a circular Py disk (diameter of 3 μm) at a fluence of 12 mJ/cm
^{2}. - Movie S2 (.avi format). Fresnel imaging of femtosecond laser pulse quenching–induced magnetic
structure change in a square Py disk (edge length of 3 μm) at a fluence of 12 mJ/cm
^{2}. - Movie S3 (.avi format). Fresnel imaging of femtosecond laser pulse quenching–induced magnetic
structure change in a triangular Py disk (edge length of 1.7 μm) at a fluence of 12
mJ/cm
^{2}. - Movie S4 (.avi format). Fresnel imaging of femtosecond laser pulse quenching–induced magnetic
structure change in a circular Py disk (diameter of 1.7 μm) at a fluence of 12 mJ/cm
^{2}. - Movie S5 (.avi format). Micromagnetic simulation on the magnetization relaxation dynamics
of the formation of a single magnetic vortex structure in the triangular Py disk (edge
length of 1.7 μm) after a femtosecond pulse quenching (fluence of 12 mJ/cm
^{2}). - Movie S6 (.avi format). Micromagnetic simulation on the magnetization relaxation dynamics
of the formation of a magnetic structure with two magnetic vortices in the triangular
Py disk (edge length of 1.7 μm) after a femtosecond pulse quenching (fluence of 12
mJ/cm
^{2}). - Movie S7 (.avi format). Micromagnetic simulation on the magnetization relaxation dynamics
of the formation of a magnetic structure with three magnetic vortices in the triangular
Py disk (diameter of 3.0 μm) after a femtosecond pulse quenching (fluence of 12 mJ/cm
^{2}). - Movie S8 (.avi format). Micromagnetic simulation on the magnetization relaxation dynamics
of the formation of a single magnetic vortex structure in the circular Py disk (diameter
of 3.0 μm) after a femtosecond pulse quenching (fluence of 12 mJ/cm
^{2}). - Movie S9 (.avi format). Micromagnetic simulation on the magnetization relaxation dynamics
of the formation of a magnetic structure with four magnetic vortices in the circular
Py disk (diameter of 3.0 μm) after a femtosecond pulse quenching (fluence of 12 mJ/cm
^{2}). - Movie S10 (.avi format). Micromagnetic simulation on the magnetization relaxation dynamics
of the formation of a magnetic structure with four magnetic vortices in the circular
Py disk (diameter of 3.0 μm) after a femtosecond pulse quenching (fluence of 12 mJ/cm
^{2}). - Movie S11 (.avi format). Micromagnetic simulation on the magnetization relaxation dynamics
of the formation of a single magnetic vortex structure in the square Py disk (edge
length of 3 μm) after a femtosecond pulse quenching (fluence of 12 mJ/cm
^{2}). - Movie S12 (.avi format). Micromagnetic simulation on the magnetization relaxation dynamics
of the formation of a magnetic structure with three magnetic vortices in the square
Py disk (edge length of 3 μm) after a femtosecond pulse quenching (fluence of 12 mJ/cm
^{2}). - Movie S13 (.avi format). Micromagnetic simulation on the magnetization relaxation dynamics
of the formation of a magnetic structure with four magnetic vortices in the square
Py disk (edge length of 3 μm) after a femtosecond pulse quenching (fluence of 12 mJ/cm
^{2}).

**Files in this Data Supplement:**- Fig. S1. Occurrence frequency distribution of femtosecond laser pulse–induced magnetic
structures in a circular Py disk at a fluence of 16 mJ/cm