Effect of Laser Irradiation on Magnetic Properties
of Amorphous FeBSiC Alloy

N. A. Skulkina*, M. A. Gorlanova*, O. A. Ivanov*, E. A. Stepanova*, A. S. Smyshlyaev*,
P. E. Markin*, I. A. Popova**, and L. E. Tsvetkova**

* Ural State University, pr. Lenina 51, Ekaterinburg, 620083 Russia
** Institute of Precision Alloys, Bardin Central Research Institute for the Iron and Steel Industry,
Vtoraya Baumanskaya ul. 9/23, Moscow, 107005 Russia

Received September 27, 1995; in final form, December 3, 1996

Abstract—The effect of local laser irradiation on the magnetic properties of soft magnetic amorphous alloys
and their stability in time is studied using an Fe₈₁B₁₃Si₄C₂ alloy as an example. Physical factors responsible for
changes in properties of the alloy are analyzed. It is shown that irradiation results in the formation of domains
with 180° domain walls and magnetization along the axis of the ribbon. In the region of a laser irradiation track,
the alloy crystallizes in part, which is accompanied by the appearance of stresses favoring the formation of
domains with in-plane magnetization perpendicular to the ribbon axis and a more complex system of closure
domains covering internal domains magnetized perpendicular to the ribbon plane. As a result, the hysteresis
properties of the alloy are affected adversely. Under certain laser-irradiation conditions, the specific core loss
of the alloy becomes lower because of a decrease in its dynamic component. Temporal changes in magnetic
properties observed after laser irradiation of the alloy may be due to relaxation processes.

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