Metamagnetic transition and a loss of magnetic hysteresis caused by electron trapping in monolayers of single-molecule magnet Tb₂@C₇₉N

Abstract

Realization of stable spin states in surface-supported magnetic molecules is crucial for their applications in molecular spintronic, memory storage or quantum information processing. In this work, we studied the surface...

Endohedral metallofullerene molecular nanomagnets

“…Thus, monolayers of Tb 2 @C 79 N were prepared on Cu (111) and Au (111) substrates. 25 While the bulk sample of Tb 2 @C 79 N is a high-blocking temperature (T B,100s = 24 K) SMM featuring a strongly ferromagnetic coupling between two Tb magnetic moments and the unpaired electron spin, a distinct antiferromagnetically coupled ground state is identified for its monolayers in XMCD studied at the Tb-M 4,5 edge. This results in a non-magnetic state in which magnetization is completely lost, and can be assigned to anionic Tb 2 @C 79 N À species with a doubly-occupied Tb-Tb bonding orbital, likely due to charge transfer from the substrate or trapping of secondary electrons.…”

“…[18][19][20][21][22] Remarkably, this structural peculiarity is not an exclusive case in EMFs, yet offers a general synthetic insight and can be extended to strongly coupled mixed-valence dilanthanide SMMs (Cp iPr5 ) 2 Ln 2 I 3 (Ln = Dy and Tb) that hold the current record T B,100s value of 72 K. 23 Exploiting the high chemical and thermal stability of fullerene structures, neutral EMF-SMMs can be readily processed into organized molecular assemblies, such as sub-monolayer deposition on substrates through sublimation or selfassembly. [24][25][26] This is in striking contrast to most ionic organometallic Ln-SMMs, which are air-and moisture-sensitive and would decompose upon heating or interacting with the substrates. This merit of EMFs allows a step forward in the field of SMMs by facilitating their further integration into spintronic devices, which would be eventually utilized to write in and read out magnetic information.…”

“…Exploiting the high chemical and thermal stability of fullerene structures, neutral EMF-SMMs can be readily processed into organized molecular assemblies, such as sub-monolayer deposition on substrates through sublimation or self-assembly. 24–26 This is in striking contrast to most ionic organometallic Ln-SMMs, which are air- and moisture-sensitive and would decompose upon heating or interacting with the substrates. This merit of EMFs allows a step forward in the field of SMMs by facilitating their further integration into spintronic devices, which would be eventually utilized to write in and read out magnetic information.…”

Theoretical Insights into the Adsorption of Rare-Earth-Containing Single-Molecule Magnets on Solid Surfaces

“…Endohedral metallofullerenes that encapsulate lanthanides within a carbon cage exhibit stable magnetic switching behavior on both metallic and insulating surfaces . Denis and colleagues conducted experimental and theoretical investigations, demonstrating that the deposition of Dy 2 ScN@C 80 on Au(111), Ag(100), and MgO/Ag(100) surfaces exhibits similar broad magnetic hysteresis behaviors, as depicted in Figure a,b.…”

Surface Deposition Induced Reduction of the Ground State Spin in Cr10 Wheel

“…An alternative approach to achieving robust on‐surface SMMs has been through the use of endohedral metallofullerenes, [ 28,29 ] in which a pair of lanthanides with strong single‐ion anisotropy and exchange coupling are encapsulated within a carbon cage. The high thermal stability of fullerenes enabled the formation of monolayers by sublimation both on metals and insulators.…”