scholarly journals Dysprosium magnesium silicate apatite featuring field and temperature stable slow magnetization relaxation

RSC Advances ◽  
2020 ◽  
Vol 10 (62) ◽  
pp. 37588-37595
Author(s):  
Pavel E. Kazin ◽  
Mikhail A. Zykin ◽  
Lev A. Trusov ◽  
Alexander V. Vasiliev ◽  
Reinhard K. Kremer ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Magnesium Silicate ◽  
Slow Relaxation ◽  
Magnetization Relaxation

The compound reveals dual magnetization relaxation with largely varying contributions from fast and slow relaxation paths controlled by field and temperature. The relaxation times retain values of a few seconds up to 40 K.

scholarly journals Leveraging Surface Siloxide Electronics to Enhance Relaxation Properties of a Single-Molecule Magnet

2020 ◽  
Author(s):  
Maciej Korzynski ◽  
Zachariah Berkson ◽  
Boris Le Guennic ◽  
Olivier Cador ◽  
Christophe Copéret
Keyword(s):  
Single Molecule ◽  
Relaxation Times ◽  
Device Fabrication ◽  
Information Storage ◽  
Commercial Application ◽  
Surface Immobilization ◽  
Single Molecule Magnets ◽  
Magnetization Relaxation ◽  
Surface Deposition ◽  
Magnitude Increase

Single-molecule magnets (SMMs) hold promise for unmatched information storage density as well as applications in quantum computing and spintronics. To date, the most successful SMMs are organometallic lanthanide complexes. However, their surface immobilization, one of the requirements for device fabrication and commercial application, remains challenging due to sensitivity of magnetic properties to small changes in the electronic structure of the parent SMM. Thus, finding controlled approaches to SMM surface deposition is a timely challenge. In this contribution we apply the concept of isolobality to identify siloxides present at the surface of partially dehydroxylated silica as a suitable replacement for archetypal ligand architectures in organometallic SMMs. We demonstrate theoretically and experimentally that isolated siloxide anchorages not only enable successful immobilization, but also lead to two-orders-of-magnitude increase in magnetization relaxation times and provide magnetic site dilution.

pH-controlled polymorphism in a layered dysprosium phosphonate and its impact on the magnetization relaxation

2015 ◽  
Vol 51 (13) ◽  
pp. 2649-2652 ◽  
Author(s):  
Dai Zeng ◽  
Min Ren ◽  
Song-Song Bao ◽  
Jian-Shen Feng ◽  
Li Li ◽  
...  
Keyword(s):  
Slow Relaxation ◽  
Energy Barriers ◽  
Magnetization Relaxation ◽  
Ph Controlled

This communication reports two polymorphic dysprosium compounds that exhibit slow relaxation of magnetization with significantly different energy barriers.

scholarly journals Increasing the effective energy barrier promoted by the change of a counteranion in a Zn–Dy–Zn SMM: slow relaxation via the second excited state

2015 ◽  
Vol 51 (62) ◽  
pp. 12353-12356 ◽  
Author(s):  
I. Oyarzabal ◽  
J. Ruiz ◽  
E. Ruiz ◽  
D. Aravena ◽  
J. M. Seco ◽  
...  
Keyword(s):  
Excited State ◽  
Energy Barrier ◽  
Slow Relaxation ◽  
Effective Energy ◽  
Magnetization Relaxation

Slow magnetization relaxation via the second excited state with a Ueff = 186 cm−1 has been observed in a Zn–Dy–Zn complex.

Multiple slow relaxation of magnetization in Dy3+ confined in the crystal matrix of rare-earth-calcium silicates with the apatite structure

2020 ◽  
Vol 49 (6) ◽  
pp. 2014-2023 ◽  
Author(s):  
Pavel E. Kazin ◽  
Mikhail A. Zykin ◽  
Lev A. Trusov ◽  
Alexander V. Vasiliev ◽  
Reinhard K. Kremer ◽  
...  
Keyword(s):  
Rare Earth ◽  
Relaxation Times ◽  
Slow Relaxation ◽  
Apatite Structure ◽  
Crystal Matrix ◽  
Calcium Silicates

Dy3+ reveals slow relaxation of magnetization in both Dy-diluted and Dy-rich silicates with enhanced relaxation times in the latter.

Dynamic Light Scattering in 5CB Confined in Disordered Porous Media

1995 ◽  
Vol 407 ◽  
Author(s):  
Fouad M. Aliev ◽  
Vladimir V. Nadtotchi
Keyword(s):  
Phase Transition ◽  
Light Scattering ◽  
Volume Fraction ◽  
Wide Spectrum ◽  
Standard Form ◽  
Relaxation Times ◽  
Slow Relaxation ◽  
Isotropic Phase ◽  
Average Pore ◽  
Dynamical Scaling

ABSTRACTWe performed dynamic and static light scattering measurements in nematic LC (5CB) confined in silica porous glasses with average pore sizes of 1000 A˚ (volume fraction of pores 40%) and 100 A˚ (27%). The experiments show significant changes in physical properties of confined LC. Nematic-isotropic phase transition temperature TNI is depressed by 0.6°C in 1000 A˚ pores compared to that bulk value and this phase transition was not detected at all in 100 A˚ pores. We found that even about 20°C below bulk melting temperature the relaxational processes in confined LC were not frozen. Slow relaxation process which does not exist in the bulk LC and wide spectrum of relaxation times (10−8 –)s appear in both 100 A˚ and 1000 A˚. In 100 A˚ pores slow relaxation exists even at T corresponding to the bulk isotropic phase. Our data can not be described using the standard form of dynamical scaling variable (t/r) but they obey activated dynamical scaling with the scaling variable x = lnt/lnr.

scholarly journals Tb-based silicate apatites showing slow magnetization relaxation with identical parameters for the Tb3+ and Dy3+ counter ions

RSC Advances ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 6926-6933
Author(s):  
Mikhail A. Zykin ◽  
Andrey K. Dyakonov ◽  
Artem A. Eliseev ◽  
Lev A. Trusov ◽  
Reinhard K. Kremer ◽  
...  
Keyword(s):  
Slow Relaxation ◽  
Magnetization Relaxation ◽  
Counter Ions ◽  
Apatite Type

Replacing Dy3+ with Tb3+ in the apatite-type silicate (Dy,Y)8Ca2(SiO4)6O2 preserves the character of the magnetization slow relaxation.

scholarly journals Leveraging Surface Siloxide Electronics to Enhance Relaxation Properties of a Single-Molecule Magnet

2021 ◽  
Author(s):  
Maciej Korzynski ◽  
Zachariah Berkson ◽  
Boris Le Guennic ◽  
Olivier Cador ◽  
Christophe Copéret
Keyword(s):  
Single Molecule ◽  
Relaxation Times ◽  
Device Fabrication ◽  
Information Storage ◽  
Commercial Application ◽  
Surface Immobilization ◽  
Single Molecule Magnets ◽  
Magnetization Relaxation ◽  
Surface Deposition ◽  
Magnitude Increase

Single-molecule magnets (SMMs) hold promise for unmatched information storage density as well as applications in quantum computing and spintronics. To date, the most successful SMMs are organometallic lanthanide complexes. However, their surface immobilization, one of the requirements for device fabrication and commercial application, remains challenging due to sensitivity of magnetic properties to small changes in the electronic structure of the parent SMM. Thus, finding controlled approaches to SMM surface deposition is a timely challenge. In this contribution we apply the concept of isolobality to identify siloxides present at the surface of partially dehydroxylated silica as a suitable replacement for archetypal ligand architectures in organometallic SMMs. We demonstrate theoretically and experimentally that isolated siloxide anchorages not only enable successful immobilization, but also lead to two-orders-of-magnitude increase in magnetization relaxation times and provide magnetic site dilution.

scholarly journals Leveraging Surface Siloxide Electronics to Enhance Relaxation Properties of a Single-Molecule Magnet

2021 ◽  
Author(s):  
Maciej Korzynski ◽  
Zachariah Berkson ◽  
Boris Le Guennic ◽  
Olivier Cador ◽  
Christophe Copéret
Keyword(s):  
Single Molecule ◽  
Relaxation Times ◽  
Device Fabrication ◽  
Information Storage ◽  
Commercial Application ◽  
Surface Immobilization ◽  
Single Molecule Magnets ◽  
Magnetization Relaxation ◽  
Surface Deposition ◽  
Magnitude Increase

Single-molecule magnets (SMMs) hold promise for unmatched information storage density as well as applications in quantum computing and spintronics. To date, the most successful SMMs are organometallic lanthanide complexes. However, their surface immobilization, one of the requirements for device fabrication and commercial application, remains challenging due to sensitivity of magnetic properties to small changes in the electronic structure of the parent SMM. Thus, finding controlled approaches to SMM surface deposition is a timely challenge. In this contribution we apply the concept of isolobality to identify siloxides present at the surface of partially dehydroxylated silica as a suitable replacement for archetypal ligand architectures in organometallic SMMs. We demonstrate theoretically and experimentally that isolated siloxide anchorages not only enable successful immobilization, but also lead to two-orders-of-magnitude increase in magnetization relaxation times.<br>

scholarly journals Leveraging Surface Siloxide Electronics to Enhance Relaxation Properties of a Single-Molecule Magnet

2020 ◽  
Author(s):  
Maciej Korzynski ◽  
Zachariah Berkson ◽  
Boris Le Guennic ◽  
Olivier Cador ◽  
Christophe Copéret
Keyword(s):  
Single Molecule ◽  
Relaxation Times ◽  
Device Fabrication ◽  
Information Storage ◽  
Commercial Application ◽  
Surface Immobilization ◽  
Single Molecule Magnets ◽  
Magnetization Relaxation ◽  
Surface Deposition ◽  
Magnitude Increase

Single-molecule magnets (SMMs) hold promise for unmatched information storage density as well as applications in quantum computing and spintronics. To date, the most successful SMMs are organometallic lanthanide complexes. However, their surface immobilization, one of the requirements for device fabrication and commercial application, remains challenging due to sensitivity of magnetic properties to small changes in the electronic structure of the parent SMM. Thus, finding controlled approaches to SMM surface deposition is a timely challenge. In this contribution we apply the concept of isolobality to identify siloxides present at the surface of partially dehydroxylated silica as a suitable replacement for archetypal ligand architectures in organometallic SMMs. We demonstrate theoretically and experimentally that isolated siloxide anchorages not only enable successful immobilization, but also lead to two-orders-of-magnitude increase in magnetization relaxation times and provide magnetic site dilution.

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