Spin Configuration and Intrinsic Coercive Field of Narrow Domain Walls in Co₅R‐Compounds

Abstract

I n ferromagnetic materials with large anisotropy constants ( K , > lo8 erg/cm3) the domain wall width, dB, is of the order of magnitude of a few lattice constants (10 to 30 A). The spin configuration of such 180"-walls in Co,R-compounds is determined within the framework of the Heisenberg model. It is found that the deviations from the microniagnetic solution occur mainly in the centre of the wall.

Atomic and micromagnetic aspects of L10 magnetism

“…Micromagnetic model calculations may break down at very small length scales [41], but the effect is relatively small. To investigate the spin structure at sharp atomic grain boundaries [9] and [42], continuum calculations were compared with the corresponding atomistic (layerresolved) J ij summation.…”

Grain-boundary micromagnetism

“…The magnetic continuum approximation breaks down on an atomic length scale [11]. In a layer-resolved analysis, (4) must be replaced by (7) where is the thickness of the atomic layers.…”

Motion of Domain Walls and the Dynamics of Kinks in the Magnetic Peierls Potential

“…The strength V 0 depends very sensitively on the ratio between the domain-wall width πl 1 and the distance a between equivalent crystallographic planes; we have V 0 ∼ e −π 2 l 1 =a [11]. Noticeable effects require l 1 ≲ 2.5a.…”

“…This sinusoidal form is known to be insensitive to the crystal structure up to exponentially small corrections [11,16]. The strength V 0 depends very sensitively on the ratio between the domain-wall width πl 1 and the distance a between equivalent crystallographic planes; we have V 0 ∼ e −π 2 l 1 =a [11].…”

“…Statics.-Minimizing the atomistic Hamiltonian (2) under the constraint of a fixed domain-wall center x gives a Peierls potential of the form [10,11,21] …”