Peculiar magnetic observations in pathological human liver

• DC magnetic measurements of normal human and patients' liver tissues.
• The presence of diamagnetic, ferrimagnetic and paramagnetic components in human liver.
• Unusual magnetic features in mantle cell lymphoma liver.

DC magnetic measurements confirm presence of (i) diamagnetic, (ii) ferri-magnetic (probably magnetite) and (iii) paramagnetic components in human liver tissues obtained from a normal person and two patients with hematological malignancies. The main observation is that patients' liver tissues show a pronounced magnetic peak at 54(1) K in their zero-field-cooled (ZFC) branches; its origin is not known. One sample shows unusual magnetic features: (i) this peak is irreversible and totally suppressed in the second ZFC sweep, (ii) around the peak position the field-cooled (FC) curve crosses the ZFC one (ZFC>FC). The two phenomena are related to each other.