The magnetic susceptibility of He-3 nanoclusters embedded in a He-4 matrix
has been measured from 0.5 to 10 mK at pressures from 2.88 to 3.54 MPa. Eve
n the lowest pressure clusters have a solid fraction in the region of the p
hase diagram where bulk solid is unstable. At 3.54 MPa, theta = -250 muK, e
qual to that of bull; 3He for v = 21.3 cm(3)/mole. For 2.88 MPa, theta = 14
0 muK, indicating a ferromagnetic tendency, similar to 2D films at some cov
erages. At intermediate pressures, chi has a peak near 1.05 mK, but with no
discontinuity. Magnetic ordering in nanoclusters appears to be different t
han the U2D2 phase of bull He-3.