Heinrich Barkhausen

Heinrich Georg Barkhausen (2 December 1881 – 20 February 1956) was a German physicist who established an influential research laboratory in Dresden. The phenomenon by which ferromagnetic domains align during magnetization and produce discrete acoustic changes due to rotations of the Weiss domains is named after his observations as the magnetic Barkhausen effect. He is also remembered in the Barkhausen criteria for electrical oscillators. Provided by Wikipedia