A sweep Arpeggio is really an arpeggio played incredibly fast. Basically speaking this is achieved by following the notes of a chord and sweeping the strings with the pick so that each individual strings is heard briefly, it is important that you try to stop each string from ringing on (as opposed to strumming a chord).
Start with a hammer-on for the following two arpeggios and then follow the notes of the A minor chord.
A Minor 'sweep' Arpeggio
G Minor 'sweep' Arpeggio
Now try the G Minor 'sweep' Arpeggio. This is the same procedure as before, however you may find it more difficult because you have to stracth your first and fourth fingers when performing the hammer-on at the beginning.
Fast Descending 'Sweep' Lick
The first two measures of this lick use the A minor and G major sweep arpeggios from the previous post, and then i'm afraid it gets progressively harder so i strongly recommend that you learn one measure at a time slowly and throughly before trying to play fast.
You will get it!
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Jimmy Hendrix Vibrato