**Figure 1:**
Magnetoresistance data with H along a [110] direction for an
MBE-grown Fe-Cr-Fe sandwich with a 16Å Cr layer. Here
the magnetoresistance Dr/r(%) is defined to be
100*[r(H=H_{s})- r(H=0)]/r(H=0). The solid-headed
arrows indicate the orientation of the moments of the two Fe
films at a given applied field. The positions of the
characteristic fields H_{J} and H_{s} are
indicated.

**Figure 2:**
Characteristic fields of an MBE-grown Fe-Cr-Fe sandwich with
a 16Å Cr layer. The fields HJ and Hs are defined as
indicated in Figure 1. The indicated
line fit has the functional form H_{s}(T) = 2.40 kOe
- (2.44x10^{-3} kOe/K)×T.

**Figure 3:** a)
Temperature dependence of the magnetoresistance for two types
of Fe-Cr sandwiches. The error bars represent the uncertainty
due to temperature drift. a) H perpendicular to I data for
two MBE-grown sandwiches. The fit parameters are: -Dr/r(T) =
2.0% - (3.3x10^{-3} %/K)×T for the
t_{Cr} = 16Å sample, and -Dr/r(T) = 1.4% -
(2.2x10^{-3} %/K)×T for the t_{Cr} = 17
Å sample.

b) H||I and H perpendicular to I data for an evaporated
polycrystalline Fe-Cr sandwich with t_{Cr} =
12Å. Both applied field directions are in the plane of
the films. For H perpendicular to I, the fit is -Dr/r(T) =
1.5% - (3.0x10^{-3} %/K)×T, while for H||I it
is -Dr/r(T) = 1.0% - (2.8x10^{-3} %/K)×T.

**Figure 4:**
Temperature dependence of the two components of the
magnetoresistance for the sample of Figure 3(b). The anisotropic
magnetoresistance (AMR) is the difference between the H||I
and H perpendicular to I curves in Figure
3(b), while the spin-valve effect is their average. The
fit to the spin-valve data is given by -Dr/r(T) = 1.3% -
(2.9x10^{-3} %/K)×T.

Wed Oct 11 09:49:01 PDT 1995