Magnetic properties of a single‐crystal sphere of nickel as a function of temperature and applied field have been measured in the critical region. The dependent variable, directly measured, is proportional to MV/B where B is the applied field and MV is the magnetic moment of the sphere in the direction of B. Below TC and for B <4πMs(T) /3, where Ms(T) is the spontaneous magnetization, M/B=3/4π. This serves as an absolute calibration of the measurement. Three types of data have been taken: (1) M/B at constant T for 20 G<B<1000 G in 2‐G steps for steps of ΔT/TC=3×10−4 from TC−0.01 TC to TC+0.01 TC; (2) M/B at constant B in steps of ΔT/TC=3×10−6 from TC−0.01 TC to TC+0.01 TC for B=20, 240, 500, and 5000 G; (3) B at constant M/B in various steps of ΔT/TC for various values of M/B near 3/4π and near 0.2. From a partial analysis of the data we find an approximate equation of state for Ni. It is: (H/M)0.764=(TTC)/0.309+ |M/39.5| 2.59. This equation of state fits well to the data of Weiss and Forrer also. But it does not fit for small values of H/M. The initial susceptibility fits better to (H/M)0.764=(TTC)/0.345.

1.
J. E.
Noakes
and
A.
Arrott
,
J. Appl. Phys.
38
,
973
(
1967
).
2.
S.
Arajs
,
J. Appl. Phys.
36
,
1136
(
1965
).
3.
P.
Weiss
and
R.
Forrer
,
Ann. Phys. (Paris)
5
,
153
(
1926
).
4.
R. B.
Griffiths
,
Phys. Rev.
158
,
176
(
1967
).
M. S.
Green
,
M.
Vicentini‐Missoni
, and
J. M. H. Levelt
Sengers
,
Phys. Rev. Letters
18
,
1113
(
1967
);
J. S.
Kouvel
and
D. S.
Rodbell
,
Phys. Rev. Letters
18
,
215
(
1967
);
L. P.
Kadanoff
,
W.
Götze
,
D.
Hamblen
,
R.
Hecht
,
E. A. S.
Lewis
,
U. U.
Palcianskas
,
M.
Rayl
,
J.
Swift
,
D.
Aspnes
, and
J.
Kane
,
Rev. Mod. Phys.
39
,
395
(
1967
).
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