scholarly journals Coherent creation and destruction of orbital wavepackets in Si:P with electrical and optical read-out

2015 ◽  
Vol 6 (1) ◽  
Author(s):  
K.L. Litvinenko ◽  
E.T. Bowyer ◽  
P.T. Greenland ◽  
N. Stavrias ◽  
Juerong Li ◽  
...  
Keyword(s):  
Orbital Motion ◽  
Exchange Interactions ◽  
Optical Excitation ◽  
Nitrogen Vacancy ◽  
Detection Methods ◽  
Level System ◽  
Magnetic Exchange ◽  
Inas Quantum Dots ◽  
All Optical ◽  
Echo Detection

Abstract The ability to control dynamics of quantum states by optical interference, and subsequent electrical read-out, is crucial for solid state quantum technologies. Ramsey interference has been successfully observed for spins in silicon and nitrogen vacancy centres in diamond, and for orbital motion in InAs quantum dots. Here we demonstrate terahertz optical excitation, manipulation and destruction via Ramsey interference of orbital wavepackets in Si:P with electrical read-out. We show milliradian control over the wavefunction phase for the two-level system formed by the 1s and 2p states. The results have been verified by all-optical echo detection methods, sensitive only to coherent excitations in the sample. The experiments open a route to exploitation of donors in silicon for atom trap physics, with concomitant potential for quantum computing schemes, which rely on orbital superpositions to, for example, gate the magnetic exchange interactions between impurities.

MAGNETO-OPTICAL MEASUREMENTS OF COLLECTIVE SPIN DYNAMICS OF TWO-DIMENSIONAL ARRAYS OF FERROMAGNETIC NANOELEMENTS

SPIN ◽  
2013 ◽  
Vol 03 (01) ◽  
pp. 1330001 ◽  
Author(s):  
BIVAS RANA ◽  
ANJAN BARMAN
Keyword(s):  
Spin Dynamics ◽  
Experimental Studies ◽  
Optical Excitation ◽  
Optical Measurements ◽  
Detection Methods ◽  
Magnetic Media ◽  
Future Directions ◽  
Collective Dynamics ◽  
Nanodot Arrays ◽  
All Optical

Magnetic nanodot arrays are interesting systems for future applications in nanotechnology including patterned magnetic media, magnonic crystals, magnetic logic, sensors, STNOs and biomedical applications. All applications require the knowledge base of magnetization processes of magnetic nanodot arrays at various time and length scales. Here, we review the present status of experimental studies of picosecond precessional magnetization dynamics in magnetic nanodot arrays. We discuss the fabrication methods of magnetic nanodot arrays and excitation and detection methods of precessional dynamics by optical means. We further discuss the all-optical excitation and detection of precessional dynamics in Ni80Fe20 (permalloy) nanodot arrays with width between 200 nm and 50 nm and with interdot separation between 50 nm and 400 nm. A transition from strongly collective dynamics to completely isolated dynamics through various weakly collective regimes, variation of precession frequency and damping with the interdot separation, effects of dipolar and quadrupolar interdot interaction, effects of the variation of dot size on the dynamics of single elements and arrays, and anisotropy of collective dynamics have been thoroughly studied by experimental and micromagnetic simulation results. Finally, we discuss the future directions in the research on the dynamics of magnetic nanodot arrays.

A new 1-1-4 pattern of magnetic exchange interactions in a cubane core tetranuclear copper (II) complex

Polyhedron ◽  
2021 ◽  
Vol 199 ◽  
pp. 115088
Author(s):  
Azadeh Mehrani ◽  
Maurice G. Sorolla ◽  
Tatyana Makarenko ◽  
Allan J. Jacobson
Keyword(s):  
Exchange Interactions ◽  
Magnetic Exchange

scholarly journals Isotropic Nature of the Metallic Kagome Ferromagnet Fe3Sn2 at High Temperatures

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 307
Author(s):  
Rebecca L. Dally ◽  
Daniel Phelan ◽  
Nicholas Bishop ◽  
Nirmal J. Ghimire ◽  
Jeffrey W. Lynn
Keyword(s):  
Elevated Temperatures ◽  
Magnetocrystalline Anisotropy ◽  
Inelastic Neutron Scattering ◽  
Exchange Interactions ◽  
Inelastic Neutron ◽  
Temperature Threshold ◽  
Magnetic Exchange ◽  
Spatial Anisotropy ◽  
Isotropic Exchange ◽  
State Spin

Anisotropy and competing exchange interactions have emerged as two central ingredients needed for centrosymmetric materials to exhibit topological spin textures. Fe3Sn2 is thought to have these ingredients as well, as it has recently been discovered to host room temperature skyrmionic bubbles with an accompanying topological Hall effect. We present small-angle inelastic neutron scattering measurements that unambiguously show that Fe3Sn2 is an isotropic ferromagnet below TC≈660 K to at least 480 K—the lower temperature threshold of our experimental configuration. Fe3Sn2 is known to have competing magnetic exchange interactions, correlated electron behavior, weak magnetocrystalline anisotropy, and lattice (spatial) anisotropy; all of these features are thought to play a role in stabilizing skyrmions in centrosymmetric systems. Our results reveal that at the elevated temperatures measured, there is an absence of significant magnetocrystalline anisotropy and that the system behaves as a nearly ideal isotropic exchange interaction ferromagnet, with a spin stiffness D(T=480 K)=168 meV Å2, which extrapolates to a ground state spin stiffness D(T=0 K)=231 meV Å2.

scholarly journals Exploiting host–guest chemistry to manipulate magnetic interactions in metallosupramolecular M4L6 tetrahedral cages

2021 ◽  
Vol 12 (14) ◽  
pp. 5134-5142 ◽  
Author(s):  
Aaron J. Scott ◽  
Julia Vallejo ◽  
Arup Sarkar ◽  
Lucy Smythe ◽  
E. Regincós Martí ◽  
...  
Keyword(s):  
Exchange Interactions ◽  
Magnetic Interactions ◽  
Magnetic Exchange ◽  
Guest Chemistry

The tetrahedral [NiII4L6]8+ cage can reversibly bind paramagnetic MX41/2− guests, inducing magnetic exchange interactions between host and guest.

scholarly journals Magnetic exchange interactions in the van der Waals layered antiferromagnet MnPSe3

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
S. Calder ◽  
A. V. Haglund ◽  
A. I. Kolesnikov ◽  
D. Mandrus
Keyword(s):  
Van Der Waals ◽  
Exchange Interactions ◽  
Magnetic Exchange

scholarly journals Analysis of the Magnetic Exchange Interactions in Yttrium(III) Complexes Containing Nitronyl Nitroxide Radicals

2017 ◽  
Vol 56 (12) ◽  
pp. 6788-6801 ◽  
Author(s):  
Julie Jung ◽  
Marin Puget ◽  
Olivier Cador ◽  
Kevin Bernot ◽  
Carmen J. Calzado ◽  
...  
Keyword(s):  
Exchange Interactions ◽  
Nitronyl Nitroxide ◽  
Nitroxide Radicals ◽  
Magnetic Exchange

Magnetic exchange interactions in transition metal dimers. VI. Tetracyanonickelate(II) ion as a bridging group

1975 ◽  
Vol 14 (10) ◽  
pp. 2577-2578 ◽  
Author(s):  
Kent R. Mann ◽  
D. Michael. Duggan ◽  
David N. Hendrickson
Keyword(s):  
Transition Metal ◽  
Exchange Interactions ◽  
Magnetic Exchange

scholarly journals Magnetic exchange interactions inBaMn2As2: A case study of theJ1-J2-JcHeisenberg model

2011 ◽  
Vol 84 (9) ◽  
Author(s):  
D. C. Johnston ◽  
R. J. McQueeney ◽  
B. Lake ◽  
A. Honecker ◽  
M. E. Zhitomirsky ◽  
...  
Keyword(s):  
Exchange Interactions ◽  
Magnetic Exchange

Magnetic exchange interactions and antiferromagnetism ofATcO3(A=Ca, Sr, Ba) studied from first principles

2012 ◽  
Vol 85 (13) ◽  
Author(s):  
V. S. Borisov ◽  
I. V. Maznichenko ◽  
D. Böttcher ◽  
S. Ostanin ◽  
A. Ernst ◽  
...  
Keyword(s):  
First Principles ◽  
Exchange Interactions ◽  
Magnetic Exchange
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