Low magnon damping of a EuSe film down to millikelvin temperatures
Researchers studied an epitaxial EuSe film to investigate its magnon damping, a key property for quantum magnonics. They found that the intrinsic ferromagnetic resonance linewidth decreases with increasing frequency and field, and becomes temperature-independent below 750 mK. This behavior suggests low magnon damping, implying a long magnon lifetime of about 2 nanoseconds.