Nanoscale physics 

Sub−barrier mutual passage of two nanosized solitons in a uniaxial magnetic film with a strong magnetic anisotropy 
Shevchenko A.B. 1, Vlaykov G.G.2, M.Yu Barabash2
1G.V. Kurdymov Institute for Metal Physics of NAS of Ukraine. Prospect Vernadskogo, 36, Kiev-03142, Ukraine. 

2Technical Centre of NAS of Ukraine. Str. Pokrovskya, 13, Kiev-04070, Ukraine. 
E-mail: bashik_77@ukr.net. 

Studies of nanosized regions of vector magnetization self – organization in domain walls (DWs) of ferromagnetic films are an essential problem in the modern nanoscale physics. In materials with a strong uniaxial magnetic anisotropy, among the elements of the inner structure of DW, topological stable formation − vertical Bloch lines (VBLs) are distinctive. These objects are of great interest due to the prospect of using them in a micro – and nanotechnologies. So, since the VBLs have low temperature macroscopic quantum properties [1−4], a pair of unipolar VBLs (magnetization vectors in both VBLs are rotated in the same direction) located in a DW of stripe domain is considered as information unit cell in hybrid memory devices “bit + qubit” [3]. 
Note that, from a mathematical point of view, VBL is a nonlinear wave formation – a soliton. In this connection it is actually to investigate their quantum collision and to establish the conditions for this phenomenon. Proceeding from this formulation of the problem, it was shown that there is a VBL sub – barrier mutual passage through each other. The physical mechanism responsible for this effect is caused by the quantum oscillations of VBLs, excited by external magnetic fields. 

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