Magnetocrystalline anisotropy of YCo5and Y2Co17

The magnetocrystalline anisotropy constants of two ferromagnetic intermetallic compounds, YCo
5
and Y
2
Co
17
, have been measured at room temperature. YCo
5
has a magnetically easy
c
axis and
K_{1} = 5.7 \times 10^{7}
erg/cm
³
; K
2
has not been determined but is estimated to be less than 10
⁶
erg/cm
³
. Y
2
Co
17
has an easy basal plane, and, by three different methods of measurement :
K_{1} + K_{2} = -3.0 \times 10^{6}
erg/cm
³
;
K_{1} = -2.9 \times 10^{6}
erg/cm
³
,
K_{2} = 0.03 \times 10^{6}
erg/cm
³
;
K_{1} = -2.1 \times 10^{6}
erg/cm
³
,
K_{2} = -0.1 \times 10^{6}
erg/cm
³
.