Importance of Polarization of Bound Projectile<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>Electrons for Transient Magnetic Fields

Abstract

$K$-vacancy fractions have been measured for Si ions moving in nickel at velocities between $3.9{v}_{0}$ and $9.0{v}_{0}$. The observed fractions, 2-23%, provide strong evidence that transient magnetic fields for ions moving in magnetized materials are caused mainly by bound, polarized electrons. A polarization close to 0.13 suffices to explain measured transient fields, and it is argued that the polarization can be due to a combination of spin-exchange interactions and capture-loss processes.