Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
PFM images of the charged domain walls: (a) Tail-to-tail and (b) head-to-head. Domain walls were written by applying of (a) positive (100 V) and (b) negative (−100 V) voltage pulses with duration of 60 s at points located along the straight dotted line with period 1.5 μm.
