Magnetic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">TbMnO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>by neutron diffraction

Magnetic ordering in ${\mathrm{TbMnO}}_{3}$ was revisited by a neutron diffraction study. In addition to the previously reported $A$-type and $G$-type modulated structures with a propagation vector $(0,{q}_{\mathrm{Mn}},0)$, we found $C$-type and $F$-type orderings of the $\mathrm{Mn}$ moments. All the components appear below ${T}_{N}^{\mathrm{Mn}}=46\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, and the $G$-, $C$-, and $F$-type components are enhanced below ${T}_{\text{lock}}=28\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, where ${q}_{\mathrm{Mn}}$ ordering locks at its low temperature value. The locking of the propagation vector also yields the squaring up of the spin arrangement. The magnetic moments of $\mathrm{Tb}$ ions show a quasi-long-range ordering below ${T}_{N}^{\mathrm{Tb}}=7\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. It drastically promotes the development of the $G$-, $C$-, and $F$-type components while suppressing the $A$-type components.