Mingming Tian, Qian Chen, Wei Jiang, Qingjie Guo, Ruobai Liu, Jun Du, Zhaocong Huang, Ya Zhai
{"title":"交换耦合诱导的Py/FeMn界面自旋动态阻尼调制","authors":"Mingming Tian, Qian Chen, Wei Jiang, Qingjie Guo, Ruobai Liu, Jun Du, Zhaocong Huang, Ya Zhai","doi":"10.1021/acsami.4c18113","DOIUrl":null,"url":null,"abstract":"The spin dynamic damping is crucial for applications in magnetic memory, sensors, and logical systems. Here, focusing on interfacial antiferromagnetic exchange coupling, the magneto-dynamics of Ni<sub>80</sub>Fe<sub>20</sub>(Py)/Fe<sub>50</sub>Mn<sub>50</sub>(FeMn) bilayers is systematically investigated. When the FeMn thickness exceeds 5 nm, an interfacial exchange bias field appears, significantly increasing the spin dynamic damping of the Py/FeMn bilayer to around 0.015. A Cu spacer is introduced between the Py and FeMn layers, and the interfacial exchange bias effect is eliminated following a dramatic decrease in the spin dynamic damping. However, a slight damping increment is observed in Py/Cu/FeMn trilayers, which is attributed to the spin pumping mechanism. Based on spin pumping theory, the estimated interfacial spin mixing conductance is 3.44 nm<sup>–2</sup> in Py/Cu/FeMn, which is attributed to the weak spin–orbit coupling of the FeMn layer. These findings indicate that the dynamic damping of Py/FeMn bilayers is primarily driven by interfacial exchange coupling rather than the spin pumping effect. Furthermore, by employing FeMn as an insertion at Py/Pt and Py/Cu interfaces, we demonstrate the short spin diffusion length for the FeMn layer, and we confirm the critical role of interfacial exchange coupling in enhancing spin dynamic damping. The exchange coupling at the Py/FeMn interface facilitates spin relaxation, resulting in the damping enhancement and blocking spin transmission from the Py to Pt (Cu) layer. These findings suggest that integrating antiferromagnetic materials with exchange coupling interfaces could significantly boost high-frequency spintronic applications.","PeriodicalId":5,"journal":{"name":"ACS Applied Materials & Interfaces","volume":"66 1","pages":""},"PeriodicalIF":8.2000,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Exchange Coupling-Induced Spin Dynamic Damping Modulation at the Py/FeMn Interface\",\"authors\":\"Mingming Tian, Qian Chen, Wei Jiang, Qingjie Guo, Ruobai Liu, Jun Du, Zhaocong Huang, Ya Zhai\",\"doi\":\"10.1021/acsami.4c18113\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The spin dynamic damping is crucial for applications in magnetic memory, sensors, and logical systems. Here, focusing on interfacial antiferromagnetic exchange coupling, the magneto-dynamics of Ni<sub>80</sub>Fe<sub>20</sub>(Py)/Fe<sub>50</sub>Mn<sub>50</sub>(FeMn) bilayers is systematically investigated. When the FeMn thickness exceeds 5 nm, an interfacial exchange bias field appears, significantly increasing the spin dynamic damping of the Py/FeMn bilayer to around 0.015. A Cu spacer is introduced between the Py and FeMn layers, and the interfacial exchange bias effect is eliminated following a dramatic decrease in the spin dynamic damping. However, a slight damping increment is observed in Py/Cu/FeMn trilayers, which is attributed to the spin pumping mechanism. Based on spin pumping theory, the estimated interfacial spin mixing conductance is 3.44 nm<sup>–2</sup> in Py/Cu/FeMn, which is attributed to the weak spin–orbit coupling of the FeMn layer. These findings indicate that the dynamic damping of Py/FeMn bilayers is primarily driven by interfacial exchange coupling rather than the spin pumping effect. Furthermore, by employing FeMn as an insertion at Py/Pt and Py/Cu interfaces, we demonstrate the short spin diffusion length for the FeMn layer, and we confirm the critical role of interfacial exchange coupling in enhancing spin dynamic damping. The exchange coupling at the Py/FeMn interface facilitates spin relaxation, resulting in the damping enhancement and blocking spin transmission from the Py to Pt (Cu) layer. These findings suggest that integrating antiferromagnetic materials with exchange coupling interfaces could significantly boost high-frequency spintronic applications.\",\"PeriodicalId\":5,\"journal\":{\"name\":\"ACS Applied Materials & Interfaces\",\"volume\":\"66 1\",\"pages\":\"\"},\"PeriodicalIF\":8.2000,\"publicationDate\":\"2025-02-25\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"ACS Applied Materials & Interfaces\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1021/acsami.4c18113\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Materials & Interfaces","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1021/acsami.4c18113","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Exchange Coupling-Induced Spin Dynamic Damping Modulation at the Py/FeMn Interface
The spin dynamic damping is crucial for applications in magnetic memory, sensors, and logical systems. Here, focusing on interfacial antiferromagnetic exchange coupling, the magneto-dynamics of Ni80Fe20(Py)/Fe50Mn50(FeMn) bilayers is systematically investigated. When the FeMn thickness exceeds 5 nm, an interfacial exchange bias field appears, significantly increasing the spin dynamic damping of the Py/FeMn bilayer to around 0.015. A Cu spacer is introduced between the Py and FeMn layers, and the interfacial exchange bias effect is eliminated following a dramatic decrease in the spin dynamic damping. However, a slight damping increment is observed in Py/Cu/FeMn trilayers, which is attributed to the spin pumping mechanism. Based on spin pumping theory, the estimated interfacial spin mixing conductance is 3.44 nm–2 in Py/Cu/FeMn, which is attributed to the weak spin–orbit coupling of the FeMn layer. These findings indicate that the dynamic damping of Py/FeMn bilayers is primarily driven by interfacial exchange coupling rather than the spin pumping effect. Furthermore, by employing FeMn as an insertion at Py/Pt and Py/Cu interfaces, we demonstrate the short spin diffusion length for the FeMn layer, and we confirm the critical role of interfacial exchange coupling in enhancing spin dynamic damping. The exchange coupling at the Py/FeMn interface facilitates spin relaxation, resulting in the damping enhancement and blocking spin transmission from the Py to Pt (Cu) layer. These findings suggest that integrating antiferromagnetic materials with exchange coupling interfaces could significantly boost high-frequency spintronic applications.
期刊介绍:
ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.