Exceeding the Curie temperature of a magnetic material via extreme heat disrupts its magnetic ordering and destroys stored data domains, which is a matter of basic physical observation and well-established scientific principle.
The claim describes a fundamental physical principle regarding magnetism (thermal demagnetization and the Curie point) that is a matter of everyday observation and textbook science. Therefore, it is categorized as COMMON_KNOWLEDGE and does not require a formal literature citation.