V.S. Semenov – Leading Research Scientist, 

V.A. Trapeznikov Institute of Control Sciences of RAS (Moscow)

E-mail: vsemsem@mail.ru

Various types of domain wall structures (DW), such as: Bloch DW, Neel DW, were theoretically investigated and experimentally confirmed for 180° DW in thin magnetic films. Compared to 180° in intermediate DW, the change in magnetization occurs by less than 180°. Although intermediate DW are observed as often as 180° DW, they are still not theoretically investigated.

Goal was to investigate intermediate Neel DW, in which the magnetization changes under the influence of an external transverse magnetic field at an angle less than 180°.

An intermediate DW was investigated, in which the change in magnetization in DW decreases under the action of an external magnetic field. An analytical model is considered, in which a logarithmic dependence is used to describe the change in magnetization in extended tails. When searching for the equilibrium state, two variables are used (the angle of rotation of the magnetization in the central region of the DW and its width). In the numerical calculation of the total energy of the DW and its components, an equal partitioning step is used both in the narrow central region and in the extended tails.

The proposed model allows one to analytically obtain the main characteristics of the distribution of magnetization in an intermediate one-dimensional Neel DW.

1. Brown W.F., Jr., La Bonte A.E. Structure and energy of one-dimensional domain walls in ferromagnetic thin films. J. Appl. Phys. 1965. V. 36. № 4. P. 1380−1386.
2. La Bonte A.E. Two-dimensional Bloch-type domain walls in ferromagnetic films. J. Appl. Phys. 1969. V. 40. № 6. P. 2450−2458.
3. Aharoni A. Asymmetry in domain walls. Phys. Stat. Sol.(a). 1973. V. 18. P. 661−667.
4. Jakubovics J.P. Analytic representation of Bloch walls in thin ferromagnetic films. Phil. Mag. 1974. V. 30. № 5. P. 983−993.
5. Hubert A. Symmetric Neel walls in thin magnetic films. Comp. Phys. Com. 1970. V. 1. P. 343−348.
6. Hubert A. Stray-field-free magnetization configurations. Phys. Stat. Sol. 1969. V. 32. P. 519−534.
7. Fuchs E. Magnetische structuren in dunnen ferromagnetischen Schicten, untersucht mit dem Electronenmicroscop. Z. Angew. Phys. 1962. B. 14. S. 203−208.
8. Semenov V.S. Analiticheskaya model domennoi granitsy Neelya s logarifmicheskim izmeneniem namagnichennosti v dovorotakh. Fizika metallov i metallovedenie. 2015. T. 116. № 1. S. 3−11. (In Russian).
9. Aharoni A. Measure of self-consistency in 180 domain walls models. J. Appl. Phys. 1968. V. 39. P. 401−406.