Cooperative multiscale aging in a ferromagnet/antiferromagnet bilayer
Cooperative multiscale aging in a ferromagnet/antiferromagnet bilayer
Anisotropic magnetoresistance measurements show that the magnetization state in epitaxial ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}/{\mathrm{Fe}}_{50}{\mathrm{Mn}}_{50}$ bilayers exhibits aging over a wide range of temperatures and magnetic fields. The observed power-law time dependence indicates that aging is characterized by a wide range of activation time scales. Aging characteristics are also inconsistent with a superposition of …