Spintronic timing switches via magnetic breather oscillations

Magnetization switching plays a pivotal role in many spintronic devices. Distinct from conventional field-driven approaches, we propose a self-induced magnetization reversal mechanism that exploits the intrinsic periodic energy focusing and dispersing behavior of magnetic breathers. In this paper, we explore magnetic breather excitations and potential applications of Kuznetsov−Ma (KM) breather in an anisotropic ferromagnet. Under the long-wavelength approximation, the magnetization dynamics of a ferromagnetic nanowire are governed by a generalized derivative nonlinear Schrödinger equation. By employing a two-fold Darboux transformation, we derive the general breather solution and classify it into five distinct types through modulation instability analysis. Numerical simulations reveal a reversible transition between magnetic solitons and KM breathers, achieved by tuning the amplitude of the background plane wave. The KM breather exhibits periodic magnetization oscillations capable of inducing time-dependent magnetoresistance. When coupled with an appropriately defined critical current, this feature facilitates the realization of autonomous timing switches. These results provide theoretical foundations for the advancement of breather-enabled spintronic technologies.