Accession Number : AD0714433

Title :   Coercive Force of Two-Layer Films,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Zvyagintsev,V. V.

Report Date : 25 AUG 1970

Pagination or Media Count : 15

Abstract : The coercive force of thin magnetic films consisting of 2 nonmagnetostrictive layers, 1 layer NiFe, the 2nd layer FeCo or NiFeCo, is studied. The coercive force, H (subscript c), of 2-layer NiFe-CoFe films grows linearly with the growth of the angular dispersion of anisotropy, alpha 80, as in single-layer films (growth of alpha 80 was reached by increasing the thickness of the CoFe layer). The dependence of H (subscript c) of NiFe-NiFeCo films on the thickness of a layer of d (subscript 2) of NiFeCo is also studied. With the growth of d (subscript 2) from zero to 400-500 A., H (subscript c) grows in connection with the fact that the presence of the satn. magnetization of the materials (J (subscript 2) is greater than J (subscript 1)) leads to the formation of addnl. poles in domain boundaries, i.e., increases the total energy of the boundaries. When d (subscript 2) is greater than 500 A., the addnl. magnetostatic energy of a boundary decreases and the growth of H (subscript c) diminishes. Theoretically obtained curves of d (subscript 2) dependence of energy and the width of domain boundaries are presented. The calculated value of d (subscript 2) in the presence of the max. value of H (subscript c) is in keeping with the exptl. obtained value. (Author)

Descriptors :   (*THIN FILM STORAGE DEVICES, MAGNETIC PROPERTIES), FRICTION, MAGNETOSTRICTION, ANISOTROPY, USSR, NICKEL ALLOYS, IRON ALLOYS, COBALT ALLOYS, METAL FILMS

Subject Categories : Computer Hardware
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE