Andrea Luigi Sorrentino, Lorenzo Poggini, Giulia Serrano, Giuseppe Cucinotta, Brunetto Cortigiani, Luigi Malavolti, Francesca Parenti, Edwige Otero, Marie-Anne Arrio, Philippe Sainctavit, Andrea Caneschi, Andrea Cornia, Roberta Sessoli, Matteo Mannini
{"title":"在二氧化钛单层上组装 Fe4 单分子磁体","authors":"Andrea Luigi Sorrentino, Lorenzo Poggini, Giulia Serrano, Giuseppe Cucinotta, Brunetto Cortigiani, Luigi Malavolti, Francesca Parenti, Edwige Otero, Marie-Anne Arrio, Philippe Sainctavit, Andrea Caneschi, Andrea Cornia, Roberta Sessoli, Matteo Mannini","doi":"10.1039/d4nr02234c","DOIUrl":null,"url":null,"abstract":"The decoration of technologically relevant surfaces, such as metal oxides, with single-molecule magnets (SMMs) constitutes a persistent challenge for the integration of these molecular systems into novel technologies and, in particular, for the development of spintronic and quantum devices. We used UHV thermal sublimation to deposit tetrairon(III) propeller-shaped SMMs (Fe<small><sub>4</sub></small>) as a single layer on a TiO<small><sub>2</sub></small> ultrathin film grown on Cu(001). The properties of the molecular deposit were studied using a multi-technique approach based on standard topographic and spectroscopic measurements, which demonstrated that molecules remain largely intact upon deposition. Ultralow temperature X-ray Absorption Spectroscopy (XAS) with linearly and circularly polarized light was further employed to evaluate both the molecular organization and the magnetic properties of the Fe4 monolayer. X-ray Natural Linear Dichroism (XNLD) and X-ray Magnetic Circular Dichroism (XMCD) showed that molecules in a monolayer display a preferential orientation and an open magnetic hysteresis with pronounced quantum tunnelling steps up to 900 mK. However, unexpected extra features in the XAS and XMCD spectra disclosed a minority fraction of altered molecules, suggesting that the TiO<small><sub>2</sub></small> film may be chemically non-innocent. The observed persistence of SMM behaviour on a metal oxide thin film opens new possibilities for the development of SMM-based hybrid systems.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":null,"pages":null},"PeriodicalIF":5.8000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Assembling Fe4 Single Molecule Magnets on a TiO2 monolayer\",\"authors\":\"Andrea Luigi Sorrentino, Lorenzo Poggini, Giulia Serrano, Giuseppe Cucinotta, Brunetto Cortigiani, Luigi Malavolti, Francesca Parenti, Edwige Otero, Marie-Anne Arrio, Philippe Sainctavit, Andrea Caneschi, Andrea Cornia, Roberta Sessoli, Matteo Mannini\",\"doi\":\"10.1039/d4nr02234c\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The decoration of technologically relevant surfaces, such as metal oxides, with single-molecule magnets (SMMs) constitutes a persistent challenge for the integration of these molecular systems into novel technologies and, in particular, for the development of spintronic and quantum devices. We used UHV thermal sublimation to deposit tetrairon(III) propeller-shaped SMMs (Fe<small><sub>4</sub></small>) as a single layer on a TiO<small><sub>2</sub></small> ultrathin film grown on Cu(001). The properties of the molecular deposit were studied using a multi-technique approach based on standard topographic and spectroscopic measurements, which demonstrated that molecules remain largely intact upon deposition. Ultralow temperature X-ray Absorption Spectroscopy (XAS) with linearly and circularly polarized light was further employed to evaluate both the molecular organization and the magnetic properties of the Fe4 monolayer. X-ray Natural Linear Dichroism (XNLD) and X-ray Magnetic Circular Dichroism (XMCD) showed that molecules in a monolayer display a preferential orientation and an open magnetic hysteresis with pronounced quantum tunnelling steps up to 900 mK. However, unexpected extra features in the XAS and XMCD spectra disclosed a minority fraction of altered molecules, suggesting that the TiO<small><sub>2</sub></small> film may be chemically non-innocent. The observed persistence of SMM behaviour on a metal oxide thin film opens new possibilities for the development of SMM-based hybrid systems.\",\"PeriodicalId\":92,\"journal\":{\"name\":\"Nanoscale\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":5.8000,\"publicationDate\":\"2024-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Nanoscale\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1039/d4nr02234c\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nanoscale","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1039/d4nr02234c","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
摘要
用单分子磁体(SMMs)装饰金属氧化物等技术相关表面,是将这些分子系统集成到新技术,特别是开发自旋电子和量子设备的一项长期挑战。我们利用超高真空热升华技术将四铁(III)螺旋桨形 SMMs(Fe4)作为单层沉积在生长在铜(001)上的二氧化钛超薄薄膜上。在标准形貌和光谱测量的基础上,采用多技术方法对分子沉积物的特性进行了研究,结果表明分子在沉积后基本保持完整。此外,还采用了线性偏振光和圆偏振光的超低温 X 射线吸收光谱(XAS)来评估 Fe4 单层的分子组织和磁性。X 射线自然线性二色性(XNLD)和 X 射线磁性圆二色性(XMCD)显示,单层中的分子显示出优先取向和开放磁滞,量子隧穿阶跃明显,最高可达 900 mK。然而,XAS 和 XMCD 光谱中意想不到的额外特征揭示了改变分子的少数部分,这表明二氧化钛薄膜可能在化学上是非无害的。在金属氧化物薄膜上观察到的 SMM 行为的持续性为开发基于 SMM 的混合系统提供了新的可能性。
Assembling Fe4 Single Molecule Magnets on a TiO2 monolayer
The decoration of technologically relevant surfaces, such as metal oxides, with single-molecule magnets (SMMs) constitutes a persistent challenge for the integration of these molecular systems into novel technologies and, in particular, for the development of spintronic and quantum devices. We used UHV thermal sublimation to deposit tetrairon(III) propeller-shaped SMMs (Fe4) as a single layer on a TiO2 ultrathin film grown on Cu(001). The properties of the molecular deposit were studied using a multi-technique approach based on standard topographic and spectroscopic measurements, which demonstrated that molecules remain largely intact upon deposition. Ultralow temperature X-ray Absorption Spectroscopy (XAS) with linearly and circularly polarized light was further employed to evaluate both the molecular organization and the magnetic properties of the Fe4 monolayer. X-ray Natural Linear Dichroism (XNLD) and X-ray Magnetic Circular Dichroism (XMCD) showed that molecules in a monolayer display a preferential orientation and an open magnetic hysteresis with pronounced quantum tunnelling steps up to 900 mK. However, unexpected extra features in the XAS and XMCD spectra disclosed a minority fraction of altered molecules, suggesting that the TiO2 film may be chemically non-innocent. The observed persistence of SMM behaviour on a metal oxide thin film opens new possibilities for the development of SMM-based hybrid systems.
期刊介绍:
Nanoscale is a high-impact international journal, publishing high-quality research across nanoscience and nanotechnology. Nanoscale publishes a full mix of research articles on experimental and theoretical work, including reviews, communications, and full papers.Highly interdisciplinary, this journal appeals to scientists, researchers and professionals interested in nanoscience and nanotechnology, quantum materials and quantum technology, including the areas of physics, chemistry, biology, medicine, materials, energy/environment, information technology, detection science, healthcare and drug discovery, and electronics.