Reexamination of macroscopic quantum tunneling in ferritin - temperature dependence of magnetic relaxation

The existence of pure quantum tunneling of macroscopic magnetic moment in the Kelvin regime is reexamined for antiferromagnetic nanoparticles in ferritin. In the present study, we discuss effects of temporary temperature change on magnetic relaxation. The results show that the relaxation slows down when the temperature is decreased, as expected for thermal activation process