Magnetic textures in the ferromagnetic phases of $\mathrm{L}{\mathrm{a}}_{1-x}\mathrm{S}{\mathrm{r}}_x\mathrm{Mn}{\mathrm{O}}_3$ for $0.15<x<0.30$ have been investigated by Lorentz microscopy combined with small-angle electron diffraction experiments. Various types of magnetic textures characterized by stripe, plate-shaped, and cylindrical (magnetic bubble) domains were found. Two distinct types of magnetic stripe domains appeared in the orthorhombic structure with an inversion symmetry of $\mathrm{L}{\mathrm{a}}_{0.825}\mathrm{S}{\mathrm{r}}_{0.175}\mathrm{Mn}{\mathrm{O}}_3$, depending significantly on magnetocrystalline anisotropy. Based on in situ observations as functions of temperature and the strength of the external magnetic field, a magnetic field-temperature phase diagram was constructed, showing the stabilization of magnetic bubbles in the ferromagnetic phase of $\mathrm{L}{\mathrm{a}}_{0.825}\mathrm{S}{\mathrm{r}}_{0.175}\mathrm{Mn}{\mathrm{O}}_3$.

• Received 21 December 2015
• Revised 15 June 2016

DOI:https://doi.org/10.1103/PhysRevB.94.024407