Large nonzero-moment magnetic strings in antiferromagnetic crystals of the manganite type

The magnetic strings in antiferromagnetic crystals with the spin S=1/2 differ from the magnetic polarons (ferrons) by the absence of the additional magnetic moment. We show that in the S>1/2 double exchange crystals with the antiferromagnetic s-d exchange, a type of magnetic string appears which possesses a magnetic moment. It is concentrated at the center of the string, and the magnetized string is, in its essence, the state intermediate between the string and the ferron. In the antiferromagnetic manganites this moment is an order of magnitude larger than that of a magnetic atom. Unlike the conventional ferrons, the magnetization of the strings exists at any parameters of the crystals under consideration. We argue that this type of magnetic state can be relevant for some doped antiferromagnets including manganites.