Fine tuning of magnetization relaxation parameters of the DyO+ single ion magnet in a hydroxy/fluoro-apatite solid solution

CrystEngComm ◽  
2019 ◽  
Vol 21 (1) ◽  
pp. 102-107 ◽  
Author(s):  
Pavel E. Kazin ◽  
Mikhail A. Zykin ◽  
Lev A. Trusov ◽  
Alexander V. Vasiliev ◽  
Irina V. Kolesnik ◽  
...  
Keyword(s):  
Solid Solution ◽  
Magnetization Reversal ◽  
Quantum Tunneling ◽  
Energy Barrier ◽  
Fine Tuning ◽  
Magnetization Relaxation ◽  
Quantum Tunneling Of Magnetization ◽  
Relaxation Parameters

Variation of the crystal environment of DyO+ regulates the energy barrier for magnetization reversal and the rate of quantum tunneling of magnetization.

scholarly journals High-Coordinate Mononuclear Ln(III) Complexes: Synthetic Strategies and Magnetic Properties

2020 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Joydev Acharya ◽  
Pankaj Kalita ◽  
Vadapalli Chandrasekhar
Keyword(s):  
Magnetic Properties ◽  
Single Molecule ◽  
Fine Tuning ◽  
Coordination Geometry ◽  
Single Molecule Magnets ◽  
Magnetization Relaxation ◽  
Quantum Tunneling Of Magnetization ◽  
Structural Correlation ◽  
High Coordination Number ◽  
High Coordination

Single-molecule magnets involving monometallic 4f complexes have been investigated extensively in last two decades to understand the factors that govern the slow magnetization relaxation behavior in these complexes and to establish a magneto-structural correlation. The prime goal in this direction is to suppress the temperature independent quantum tunneling of magnetization (QTM) effect via fine-tuning the coordination geometry/microenvironment. Among the various coordination geometries that have been pursued, complexes containing high coordination number around Ln(III) are sparse. Herein, we present a summary of the various synthetic strategies that were used for the assembly of 10- and 12-coordinated Ln(III) complexes. The magnetic properties of such complexes are also described.

Magnetization reversal in individual nanoparticles: macroscopic quantum tunneling of magnetization

1998 ◽  
Vol 34 (4) ◽  
pp. 973-978 ◽  
Author(s):  
W. Wernsdorfer ◽  
E. Bonet Orozco ◽  
B. Barbara ◽  
A. Benoit ◽  
D. Mailly ◽  
...  
Keyword(s):  
Magnetization Reversal ◽  
Quantum Tunneling ◽  
Macroscopic Quantum ◽  
Quantum Tunneling Of Magnetization ◽  
Macroscopic Quantum Tunneling ◽  
Individual Nanoparticles

scholarly journals Условия возникновения спонтанной осциллирующей магнитной релаксации в синтетических ферримагнетиках Pt/Co/Ir/Co/Pt

2020 ◽  
Vol 62 (3) ◽  
pp. 407
Author(s):  
Р.Б. Моргунов ◽  
А.И. Безверхний ◽  
О.С. Дмитриев ◽  
M.В. Бахметьев
Keyword(s):  
Magnetic Anisotropy ◽  
Total Energy ◽  
Magnetization Reversal ◽  
Energy Barrier ◽  
Magnetic Relaxation ◽  
Perpendicular Magnetic Anisotropy ◽  
Free Layer ◽  
Zeeman Energy ◽  
Magnetization Relaxation ◽  
Triple Points

We had established that the non-monotonic magnetic relaxation appeared, when two or three magnetic fields, switching between stable magnetization states, coincide with each other, in Pt/Co/Ir/Co/Pt synthetic ferrimagnets with perpendicular magnetic anisotropy. Switching fields between stable magnetization states depend on sum of exchange interlayer energy, Zeeman energy and magnetization reversal energy barrier of each layer. This total energy depends on layers thickness and temperature. We had shown that with choose of temperature and free layer thickness we can achieve double or triple points on energy states diagram, which is reason of nonmonotonic magnetization relaxation.

Influence of magnetic dilution on relaxation processes in a solid solution comprising tetrahedral Co/ZnII complexes

2020 ◽  
Vol 49 (20) ◽  
pp. 6807-6815 ◽  
Author(s):  
Magdalena Ceglarska ◽  
Olaf Stefańczyk ◽  
Shin-ichi Ohkoshi ◽  
Anna M. Majcher-Fitas
Keyword(s):  
Solid Solution ◽  
Low Temperatures ◽  
Quantum Tunneling ◽  
Relaxation Times ◽  
Relaxation Processes ◽  
Direct Process ◽  
Quantum Tunneling Of Magnetization ◽  
Magnetic Dilution

Dilution with diamagnetic species in a SIM solid solution leads to an increase in relaxation times at low temperatures and monotonously reduces the probability of quantum tunneling of magnetization and the direct process.

Exchange-Biasing in a Dinuclear Dysprosium(III) Single-Molecule Magnet with a Large Energy Barrier for Magnetization Reversal

2019 ◽  
Author(s):  
Tian Han ◽  
Marcus J. Giansiracusa ◽  
Zi-Han Li ◽  
You-Song Ding ◽  
Nicholas F. Chilton ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Energy Barrier ◽  
Magnetic Hysteresis ◽  
Large Energy ◽  
Magnetic Studies ◽  
Bridging Ligands ◽  
Single Molecule Magnet ◽  
Exchange Biasing

A dichlorido-bridged dinuclear dysprosium(III) single-molecule magnet [Dy<sub>2</sub>L<sub>2</sub>(<i>µ</i>-Cl)<sub>2</sub>(THF)<sub>2</sub>] has been made using a diamine-bis(phenolate) ligand, H<sub>2</sub>L. Magnetic studies show an energy barrier for magnetization reversal (<i>U</i><sub>eff</sub>) around 1000 K. Exchange-biasing effect is clearly seen in magnetic hysteresis with steps up to 4 K. <i>Ab</i> initio calculations exclude the possibility of pure dipolar origin of this effect leading to the conclusion that super-exchange <i>via</i> the chloride bridging ligands is important.

scholarly journals A dichlorido-bridged dinuclear Dy(iii) single-molecule magnet with an effective energy barrier larger than 600 K

2019 ◽  
Vol 55 (55) ◽  
pp. 7930-7933 ◽  
Author(s):  
Tian Han ◽  
You-Song Ding ◽  
Zi-Han Li ◽  
Ke-Xin Yu ◽  
Yuan-Qi Zhai ◽  
...  
Keyword(s):  
Single Molecule ◽  
Magnetization Reversal ◽  
Energy Barrier ◽  
Large Energy ◽  
Effective Energy ◽  
Single Molecule Magnet

A large energy barrier for magnetization reversal of about 623 K is observed in a dichlorido-bridged Dy(iii) dimer.

scholarly journals Spontaneous magnetization reversal caused by magnetic noise in ε-In0.24Fe1.76O3 nanoparticles

2018 ◽  
Vol 185 ◽  
pp. 04028
Author(s):  
Alexei Dmitriev
Keyword(s):  
Magnetic Field ◽  
Magnetization Reversal ◽  
Spontaneous Magnetization ◽  
Viscosity Data ◽  
Magnetic Noise ◽  
Magnetic Fluctuations ◽  
Magnetization Relaxation ◽  
Thermally Activated ◽  
Magnetic Viscosity ◽  
Noise Frequency

Kinetics of magnetization relaxation of the exotic ε-In0.24Fe1.76O3 nanoparticles under applied magnetic field has been studied. The fluctuation field and the activation volume have been calculated from the magnetic viscosity data. The relation between magnetic viscosity and magnetic noise caused by the random thermally activated magnetization reversal of a single nanoparticle has been established. Stepped sweeping of magnetic field expands the windows of experimentally detectable magnetic fluctuations. The changes in the reversal magnetic field provide ε-In0.24Fe1.76O3 nanoparticles scanning and sorting them by magnetic noise frequency.

Sign in / Sign up

Export Citation Format

Share Document