Место издания:Multiprint ( ООО ”ПКЦ АЛЬТЕКС” ) Moscow
Первая страница:31
Последняя страница:32
Аннотация:We propose a control element for a Josephson spin valve. It is a complex
Josephson device containing ferromagnetic (F) layer in the weak-link area consist-
ing of two regions, representing 0 and p Josephson junctions, respectively. The
valve’s state is deined by mutual orientations of the F-layer magnetization vector
and boundary line between 0 and p sections of the device. We consider possi-
ble implementation of the control element by introduction of a thin normal metal
ayer in a part of the device area. By means of theoretical simulations, we study
properties of the valve’s structure as well as its operation, revealing such advan-
tages as simplicity of control, high characteristic frequency, and good legibility of
the basic states.
In addition we discuss several general properties of the current transport
through a long Josephson junction with alternating critical current density. This
alternating density can be achieved in experiment by incorporating of the mag-
netic layer to the weak link in a special way. Prospects for the practical use of such
structures are related to the possibility of obtaining bistable Josephson elements
on their basis. Joint analysis for both the current-phase relations and the dynamic
characteristics allowed to optimize the operation mode for fast superconducting
memory cell based on the bistable contact and to assess the energy dissipation for
”Read” and ”Write” operations.
