The shielding effects of a C cage on the magnetic moments of transition metal atoms inside the corner holes of Si(111)-(7 × 7).

08:00 EDT 15th March 2019 | BioPortfolio

Summary of "The shielding effects of a C cage on the magnetic moments of transition metal atoms inside the corner holes of Si(111)-(7 × 7)."

The strong interaction between transition metal (TM) atoms and semiconductor surface atoms may diminish the magnetic moments of the TM atoms and prevent them from being used as single atom spin-based devices. A carbon cage that can encapsulate TM atoms and isolate them from interacting with surface atoms is considered to protect the magnetic moments of the TM atoms. We have studied the magnetic moments of Fe, Co, and Ni atoms adsorbed inside the corner hole of Si(111)-(7 × 7) by using first-principles calculations based on the density functional theory. The results show that when Co and Ni atoms are directly adsorbed inside the corner hole, the magnetic moments are 1.353μB and 0, respectively. However when a C60 cage is used to encapsulate the atoms, the magnetic moments increase to 1.849μB and 0.884μB, respectively. The results show a clear protecting effect of a carbon cage. For Fe with and without C60, the magnetic moments are 2.909μB and 2.825μB, respectively. The presence of a C60 cage can also maintain their magnetic moments. Further analysis shows that the TM atoms possess magnetic moments when the conduction electrons are localized around them. All the results can be well understood in the framework of the Anderson impurity model. Our results demonstrate that a carbon cage may effectively protect the magnetic moments of TM atoms. This provides a new strategy for developing single atom spin-based devices on semiconductors.


Journal Details

This article was published in the following journal.

Name: Nanoscale
ISSN: 2040-3372


DeepDyve research library

PubMed Articles [21900 Associated PubMed Articles listed on BioPortfolio]

Spin-orbit effects on the Te magnetic-shielding tensor: A cluster-based ZORA/DFT investigation.

Cluster-based calculations of Te magnetic-shielding tensors demonstrate that inclusion of spin-orbit effects is necessary to obtain the best agreement of theoretical predictions with experiment. The s...

Functionalization of the transition metal oxides FeO, CoO, and NiO with alkali metal atoms decreases their ionization potentials by 3-5 eV.

The existence and stabilities of various neutral metal oxides of formula MON and MON (M = Fe, Co, Ni; N = Li, Na) and their corresponding cations MON and MON are predicted using density functi...

Localization Transition for Light Scattering by Cold Atoms in an External Magnetic Field.

We establish a localization phase diagram for light in a random three-dimensional (3D) ensemble of motionless two-level atoms with a threefold degenerate upper level, in a strong static magnetic field...

Towards magnetic alumina: uncovering the roles of transition metal doping and electron hybridization in spin delocalization.

Judicious doping of normally diamagnetic alumina (Al2O3) could lead to bulk magnetism that would enable the usage of cutting edge technology, such as magnetoforming, to create advanced systems that ta...

Doping-induced insulator-metal transition in the Lifshitz magnetic insulator NaOsO3.

By means of first principles schemes based on magnetically constrained density functional theory and on the band unfolding technique we study the effect of doping on the conducting behaviour of the Li...

Clinical Trials [4616 Associated Clinical Trials listed on BioPortfolio]

The Effects of Large Head Metal on Metal Hip Prosthesis on Soft Tissue: Study With 3 Tesla Nuclear Magnetic Resonance (NMR)

Symptomatic and asymptomatic patients wearing Metal on Metal hip prosthesis will be enrolled in the study and periimplant pseudotumors will be searched by means of NMR (Nuclear Magnetic Re...

The Effects of Phototherapy in Preterm Infants Pda

The study was designed to assess whether chest shielding during phototherapy reduces the incidence of PDA, as assessed by serial echocardiographic examinations, in a population of extremel...

Stand-Alone Cage Verus Anterior Plating for Anterior Cervical Discectomy and Fusion.

The purpose of this study is to compare the clinical results between two different techniques for ACDF: 1. Stand-alone ACDF, which means the placement of an interbody device (cage) without...

Post-Approval Prospective Study - Conventus CAGE™ PH for Use in Proximal Humerus Fracture Fixation

The purpose of this study is to collect device and procedure experience in everyday clinical practice. The patients are being asked to participate in this study because they are a surgical...

Single Center Post Approval Proximal Humerus Fixation With the Conventus Cage PH™ Device

The Conventus CAGE™ PH (PH Cage) System Post-Approval Observational Data Collection Study (Study) is a single center, prospective, post-approval clinical study designed to collect device...

Medical and Biotech [MESH] Definitions

A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING.

Neutral or negatively charged ligands bonded to metal cations or neutral atoms. The number of ligand atoms to which the metal center is directly bonded is the metal cation's coordination number, and this number is always greater than the regular valence or oxidation number of the metal. A coordination complex can be negative, neutral, or positively charged.

The ability of an element or metallic alloy to allow the passage of ELECTRONS without ELECTRICAL RESISTANCE and expel MAGNETIC FIELDS below a certain threshold temperature called superconducting transition temperature.

Porphyrins which are combined with a metal ion. The metal is bound equally to all four nitrogen atoms of the pyrrole rings. They possess characteristic absorption spectra which can be utilized for identification or quantitative estimation of porphyrins and porphyrin-bound compounds.

The reaction of two molecular entities via oxidation usually catalyzed by a transition metal compound and involving dioxygen as the oxidant.

Quick Search


DeepDyve research library

Searches Linking to this Article