Anisotropic gigant magnetoresistive effect in a magnetically ordered three-layer film

Using the phenomenological approach [1-4] the theoretical analysis of the anisotropic effect of a giant magnetic resonance (GMR) in a three-layer magnetically ordered film has been analyzed. It is shown that in the case when the direction of the current density vector j coincides with the direction of the magnetization vector M, the consideration of the anisotropy of the resistance results in a decrease of the magnitude of the GMR effect, while at the same time, when the vectors are mutually perpendicular in the film plane (j⊥M), the magnitude of the giant magnetic resistivity increases. The analysis of the dimensional dependence (dependending on the thickness d
m2
of the covering magnetic layer) on the anisotropic effect of the giant magnetic resistor shows that, as in the case of an isotropic GMR effect [5], in the case of performing inequalities d
m2
<< d
m1
(d
m2
>> d
m1
) (d
m1
— the thickness of the basic magnetic layer), this effect is negligible due to shunting by the basic (covering) magnetic layer of covering (basic) layer. In the case when the thickness of the magnetic layers is equal (d
m1
∼d
m2
) the magnitude of the anisotropic effect of the giant magnetoresistance acquires its maximum (amplitude) value due to the lack of shunt effect.