The paper reports the discovery of a hexa-tert-butyl-dysprosocenium complex, [Dy(CpIII)$_2$][B(C$_6$F$_5$)$_4$], which exhibits magnetic hysteresis up to 60 K at a sweep rate of 22 Oe s$^{-1}$. This is a significant advancement, as previous studies have only achieved hysteresis temperatures up to 14 K using similar sweep rates. The researchers observed a clear change in relaxation dynamics at 60 K, which persisted in magnetically diluted samples, suggesting that the hysteresis is due to localized metal-ligand vibrational modes unique to dysprosocenium. Ab initio spin dynamics calculations support this conclusion, indicating that magnetic relaxation at high temperatures is driven by local molecular vibrations. This finding suggests that with careful molecular design, magnetic data storage in single molecules at temperatures above liquid nitrogen may become feasible. The study also highlights the importance of the constrained metal-ligand vibrational modes in the bis-η5-CpIII coordination geometry, which could lead to improved magnetic properties.The paper reports the discovery of a hexa-tert-butyl-dysprosocenium complex, [Dy(CpIII)$_2$][B(C$_6$F$_5$)$_4$], which exhibits magnetic hysteresis up to 60 K at a sweep rate of 22 Oe s$^{-1}$. This is a significant advancement, as previous studies have only achieved hysteresis temperatures up to 14 K using similar sweep rates. The researchers observed a clear change in relaxation dynamics at 60 K, which persisted in magnetically diluted samples, suggesting that the hysteresis is due to localized metal-ligand vibrational modes unique to dysprosocenium. Ab initio spin dynamics calculations support this conclusion, indicating that magnetic relaxation at high temperatures is driven by local molecular vibrations. This finding suggests that with careful molecular design, magnetic data storage in single molecules at temperatures above liquid nitrogen may become feasible. The study also highlights the importance of the constrained metal-ligand vibrational modes in the bis-η5-CpIII coordination geometry, which could lead to improved magnetic properties.