Correlation of Blocking and Néel Temperatures in Ultra-thin Metallic Antiferromagnets

• DOI: 10.48550/arxiv.2309.15545
• Publication Date: 2023-01-01
• Authors: Kutay Akın; Hasan Pişkin; Ege Selvi; Emre Demircanli; Sevval Ari; Mohammad Hassan R...; Bayram Kocaman; O. Ozatay
• Keywords: Permalloy

Nonvolatile spintronics-based devices that utilize electron spin both to store and transport information face a great challenge when scaled nano dimensions due loss of thermal stability stray field induced disturbance in closely packed magnetic bits. The potential replacement ferromagnetic materials with antiferromagnets may overcome some these issues owing the superior robustness sublattice orientations as long theyare kept well below N\'eel temperature, which is hard measure conventional methods, especially ultrathin limit. In this work, we have employed pumping from soft NiFe layer into widely used metallic antiferromagnet Ir20Mn80, FeMn, PtMn, PdMn or NiMn thicknesses 0.7-3 nm range, probe detect damping enhancement during phase transitions. Independent measurements blocking temperature magnetometry reveal dependent shifts resonance peaks can also be allowing analysis correlation between temperatures trilayers permalloy antiferromagnetic separated by 3 thick spacer layer. thickness characterization provides key element for scalable ultrafast spintronics.