An S = 6 Cyanide-Bridged Octanuclear FeIII4NiII4 Complex that Exhibits Slow Relaxation of the Magnetization

Li, Dongfeng; Parkin, Sean; Wang, Guangbin; Yee, Gordon T.; Clérac, Rodolphe; Wernsdorfer, Wolfgang; Holmes, Stephen M.

doi:10.1021/ja058626i

Cited by 218 publications

(168 citation statements)

References 11 publications

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“…An ensemble of several thousands of Ta/Co/NiFe/AlO x / NiFe MTJs 32 with OMCs 48 were treated with oxygen plasma. Oxygen plasma burnt several molecular bridges along the exposed edges.…”

Section: Ability To Perform Reversible Experimentsmentioning

confidence: 99%

Advantages of Prefabricated Tunnel Junction-Based Molecular Spintronics Devices

Tyagi

Friebe

Baker

2015

NANO

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Molecule-based devices may govern the advancement of the next generation's logic and memory devices. Molecules have the potential to be unmatched device elements as chemists can mass produce an endless variety of molecules with novel optical, magnetic and charge transport characteristics. However, the biggest challenge is to connect two metal leads to a target molecule (s) and develop a robust and versatile device fabrication technology that can be adopted for commercial scale mass production. This paper discusses distinct advantages of utilizing commercially successful tunnel junctions as a vehicle for developing molecular spintronics devices. We describe the use of a prefabricated tunnel junction with the exposed sides as a testbed for molecular device fabrication. On the exposed sides of a tunnel junction molecules are bridged across an insulator by chemically bonding with the two metal electrodes; sequential growth of metal-insulator-metal layers ensures that separation between two metal electrodes is controlled by the insulator thickness to the molecular device length scale. This paper highlights various attributes of tunnel junction-based molecular devices with ferromagnetic electrodes for making molecular spintronics devices. We strongly emphasize a need for close collaboration between chemists and magnetic tunnel junction (MTJ) researchers. Such partnerships will have a strong potential to develop tunnel junction-based molecular devices for futuristic areas such as memory devices, magnetic metamaterials, high sensitivity multi-chemical biosensors, etc.

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“…An ensemble of several thousands of Ta/Co/NiFe/AlO x / NiFe MTJs 32 with OMCs 48 were treated with oxygen plasma. Oxygen plasma burnt several molecular bridges along the exposed edges.…”

Section: Ability To Perform Reversible Experimentsmentioning

confidence: 99%

Advantages of Prefabricated Tunnel Junction-Based Molecular Spintronics Devices

Tyagi

Friebe

Baker

2015

NANO

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“…8,9 MTJMSD is the only available system on which the e®ect of paramagnetic molecules was studied systematically. 8 A MTJMSD relies on converting a prefabricated MTJ into MSD (Fig.…”

Section: Experimental Con¯rmationmentioning

confidence: 99%

“…7(c)]. 9,17 Those OMCs, whose two alkane tethers bridged across the AlOx insulator of a MTJ [ Fig. 7(b)], became the part of a molecular device, and yielded a MTJMSD cylinder.…”

Section: Experimental Con¯rmationmentioning

confidence: 99%

“…9,17 In an OMC, the FeIII and NiII centers positioned in alternate corners of a box and are linked via cyanides [ Fig. 7(c)].…”

Section: Experimental Con¯rmationmentioning

confidence: 99%

“…3,4 Molecular channels with a net spin state are the basis of a large number of intriguing studies, 5 which were either observed experimentally 6,7 or were calculated theoretically. 2 Porphyrins, 8 single molecular magnets 2 and magnetic molecular clusters 9 possess a net spin state and can be synthetically tailored to be employed in a MSD. Single molecular magnet-based MSDs have been widely discussed as the practical architecture for quantum computation.…”

Section: Introductionmentioning

confidence: 99%

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Monte Carlo and Experimental Magnetic Studies of Molecular Spintronics Devices

Tyagi

D’Angelo

Baker

2015

NANO

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Molecule-based spintronics devices (MSDs) are highly promising candidates for discovering advanced logic and memory computer units. An advanced MSD will require the placement of paramagnetic molecules between the two ferromagnetic (FM) electrodes. Due to extreme fabrication challenges, only a couple of experimental studies could be performed to understand the e®ect of magnetic molecules on the overall magnetic and transport properties of MSDs. To date, theoretical studies mainly focused on charge and spin transport aspects of MSDs; there is a dearth of knowledge about the e®ect of magnetic molecules on the magnetic properties of MSDs. This paper investigates the e®ect of magnetic molecules, with a net spin, on the magnetic properties of 2D MSDs via Monte Carlo (MC) simulations. Our MC simulations encompass a wide range of MSDs that can be realized by establishing di®erent kinds of magnetic interactions between molecules and FM electrodes at di®erent temperatures. The MC simulations show that ambient thermal energy strongly in°uenced the molecular coupling e®ect on the MSD. We studied the nature and strength of molecule couplings (FM and antiferromagnetic) with the two electrodes on the magnetization, speci¯c heat and magnetic susceptibility of MSDs. For the case when the nature of molecule interaction was FM with one electrode and antiferromagnetic with another electrode the overall magnetization shifted toward zero. In this case, the e®ect of molecules was also a strong function of the nature and strength of direct coupling between FM electrodes. In the case when molecules make opposite magnetic couplings with the two FM electrodes, the MSD model used for MC studies resembled with the magnetic tunnel junction based MSD. The experimental magnetic studies on these devices are in agreement with our theoretical MC simulations results. Our MC simulations will enable the fundamental understanding and 1550056-1 NANO: Brief Reports and Reviews Vol. 10, No. 4 (2015) designing of a wide range of novel spintronics devices utilizing a variety of molecules, nanoclusters and quantum dots as the device elements.

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Nano/Microporous Materials: Transition Metal Cyanides

Collins

Zhou

2005

Encyclopedia of Inorganic Chemistry

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Transition metal–cyanide clusters, in which the cyanide anion acts as a bridging ligand, exhibit a rich variety of shapes and sizes, from simple squares to high‐nuclearity cubes and octahedra. Clusters may be homometallic or heterometallic, and a significant fraction of the transition metals are represented among these materials. Magnetic coupling in these clusters is widespread owing to the proximity of the metals and short length of the bridging cyanide. This review examines the structures and magnetic properties of the major types of transition metal–cyanide cluster materials.

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An S = 6 Cyanide-Bridged Octanuclear Fe^III₄Ni^II₄ Complex that Exhibits Slow Relaxation of the Magnetization

Cited by 218 publications

References 11 publications

Advantages of Prefabricated Tunnel Junction-Based Molecular Spintronics Devices

Advantages of Prefabricated Tunnel Junction-Based Molecular Spintronics Devices

Monte Carlo and Experimental Magnetic Studies of Molecular Spintronics Devices

Nano/Microporous Materials: Transition Metal Cyanides

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