Orbital and Spin Magnetization in Fe-Co, Fe-Ni, and Ni-Co

The effective electronic orbital contribution

M_{0}

and the effective electronic spin contribution

M_{s}

to the spontaneous magnetization

M_{t}

for binary alloys of Fe, Co, and Ni are determined from Scott's measured magnetomechanical

g^{'}

-factors using the relations

\frac{M_{0}}{M_{t}} = \frac{(2 - g^{'})}{g^{'}}

and

\frac{M_{s}}{M_{t}} = \frac{2 (g^{'} - 1)}{g^{'}}

where

g^{'}

is assumed to be independent of the strength of the magnetic field and the temperature. It is believed that

\frac{M_{0}}{M_{t}}

has several-fold greater accuracy when determined from the

g^{'}

factors than when determined from ferromagnetic-resonance

g

factors. In terms of the Bohr magneton

μ_{B}

, the orbital magnetic moments for the pure elements at 300°K are: for iron,

(0.0918 \pm 0.0033) μ_{B}

(4.22% of

M_{t}

); for cobalt,

(0.1472 \pm 0.0034) μ_{B}

(8.81% of

M_{t}

); and for nickel,

(0.0508 \pm 0.0012) μ_{B}

(8.92% of

M_{t}

). The

M_{s}

values for the fcc phases of the alloys agree well with those reported by Meyer and Asch from their

g

-factor data. For these alloys,

M_{0}

is much more sensitive to the crystalline structure than

M_{s}

and

M_{t}

are. The relationship

g^{' - 1} + g^{- 1} = 1

holds for Fe-Ni and Fe-Co alloys (with the exception of one point) within the accuracy of the

g

-factor measurements (∼0.1-1.0%).

This publication has 9 references indexed in Scilit: