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Grade_____________/10

MatSE 430 - Homework #4 - Due 9/21/00
Thin Films and Epitaxy

1. Consider iron flakes that are extended along the (200) plane and thin in the [100] direction. Iron has an easy axis in the [001] direction. If the flakes are dropped onto the flat surface of a specimen holder,

a) Draw the theta-2theta xray diffraction pattern expected. (Use CuKalpha radiation for all below.)

b) Draw the phi-scan of the (110) xray diffraction peak expected.

If a magnetic field is now applied in the plane of the deposit,

c) Draw the theta-2theta xray diffraction pattern expected.

d) Draw the phi-scan of the (110) xray diffraction peak expected.

2. The measured theta-2theta and phi-scans for two platinum (F cubic) thin films are shown below. The first set of plots is for a platinum film grown on a silicon single crystal and the second set is for a platinum film grown on a SrTiO3 single crystal.

a) Which film(s) is(are) epitaxial? Why?

b) For the epitaxial film(s) specify the orientation relationship. Show how you arrived at your answer.