scholarly journals Tunable magnetization steps in mixed valent ferromagnet Eu2CoMnO6

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Nara Lee ◽  
Jong Hyuk Kim ◽  
Dong Gun Oh ◽  
Hyun Jun Shin ◽  
Hwan Young Choi ◽  
...  
Keyword(s):  
Material Processing ◽  
Magnetic Properties ◽  
Single Crystals ◽  
Magnetic State ◽  
Hysteresis Loops ◽  
Double Perovskite ◽  
Processing Parameters ◽  
Perovskite Oxides ◽  
Efficient Approach ◽  
Isothermal Magnetization

AbstractMagnetic properties can be manipulated to enhance certain functionalities by tuning different material processing parameters. Here, we present the controllable magnetization steps of hysteresis loops in double-perovskite single crystals of Eu2CoMnO6. Ferromagnetic order emerges below TC ≈ 122 K along the crystallographic c axis. The difficulty in altering Co2+ and Mn4+ ions naturally induces additional antiferromagnetic clusters in this system. Annealing the crystals in different gas environments modifies the mixed magnetic state, and results in the retardation (after O2-annealing) and bifurcation (after Ar-annealing) of the magnetization steps of isothermal magnetization. This remarkable variation offers an efficient approach for improving the magnetic properties of double-perovskite oxides.

ChemInform Abstract: High-Pressure Synthesis, Crystal Structures, and Magnetic Properties of 5d Double-Perovskite Oxides Ca2MgOsO6and Sr2MgOsO6.

ChemInform ◽  
2015 ◽  
Vol 46 (24) ◽  
pp. no-no
Author(s):  
Yahua Yuan ◽  
Hai L. Feng ◽  
Madhav Prasad Ghimire ◽  
Yoshitaka Matsushita ◽  
Yoshihiro Tsujimoto ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Crystal Structures ◽  
Double Perovskite ◽  
Perovskite Oxides ◽  
High Pressure Synthesis ◽  
Pressure Synthesis

scholarly journals Spontaneous atomic ordering and magnetism in epitaxially stabilized double-perovskites

2012 ◽  
Vol 1454 ◽  
pp. 3-13
Author(s):  
Akira Ohtomo ◽  
Suvankar Chakraverty ◽  
Hisanori Mashiko ◽  
Takayoshi Oshima ◽  
Masashi Kawasaki
Keyword(s):  
Magnetic Properties ◽  
Transition Metals ◽  
Double Perovskite ◽  
Perovskite Oxides ◽  
Epitaxial Films ◽  
Atomic Ordering ◽  
Magnetic Ground State ◽  
Half Metallic ◽  
Optical Band Gaps

ABSTRACTWe report on the atomic ordering of B-site transition-metals and magnetic properties in double-perovskite oxides, La2CrFeO6 (LCFO) and La2VMnO6 (LVMO), which have never been reported to exist in ordered forms. These double-perovskite oxides are particularly interesting because of possible ferromagnetism (expected from the Kanamori-Goodenough rule for LCFO) and half-metallic antiferromagnetism (predicted for LVMO). Using pulsed-laser deposition technique with single solid-solution targets, we have prepared epitaxial films in ordered forms. Despite similar ionic characters of constituent transition-metals in each compound, the maximum B-site order attained was surprisingly high, ∼90% for LCFO and ∼80% for LVMO, suggesting a significant role of epitaxial stabilization in the spontaneous ordering process. Magnetization and valence state characterizations revealed that the magnetic ground state of both compounds was coincidently ferrimagnetic with saturation magnetization of ∼2μBper formula unit, unlike those predicted theoretically. In addition, they were found to be insulating with optical band-gaps of 1.6 eV and 0.9 eV for LCFO and LVMO, respectively. Our results present a wide opportunity to explore novel magnetic properties of binary transition-metal perovskites upon epitaxial stabilization of the ordered phase.

scholarly journals A comparative thermomagnetic study of melt-spun Nd-Fe-B alloys with different Nd content

2009 ◽  
Vol 41 (3) ◽  
pp. 337-345 ◽  
Author(s):  
A. Grujic ◽  
T. Zák ◽  
N. Talijan ◽  
J. Stajic-Trosic ◽  
V. Cosovic
Keyword(s):  
Magnetic Properties ◽  
Phase Composition ◽  
Magnetic State ◽  
Hysteresis Loops ◽  
Direct Influence ◽  
X Ray ◽  
Thermomagnetic Analysis ◽  
Melt Spun ◽  
Before And After ◽  
Fe2b Phase

Changes in the phase composition and magnetic properties of three types of commercial Nd-Fe-B alloys with different Nd content - low (10-12 wt%), near stoichiometric (21-25 wt%) and rich (26-29 wt%) caused by thermomagnetic analysis (TM) were observed in regard to optimal magnetic state. Phase compositions of investigated alloys before and after TM measurement up to 800?C were compared using 57Fe M?ssbauer spectroscopy and X-Ray analysis. The TM measurements decompose all three materials and the main products of decomposition process ?-Fe and Fe2B phase. Observed changes in structure and phase composition had direct influence on magnetic properties. Loss of magnetic properties induced by thermal decomposition is clearly illustrated on corresponding SQUID hysteresis loops.

Decoupling of the Magnetic State in RuSr2Eu1.5Ce0.5Cu2O10-δ

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3617-3621 ◽  
Author(s):  
I. Felner ◽  
E. Galstyan
Keyword(s):  
Magnetic Properties ◽  
Elevated Temperatures ◽  
Magnetic State ◽  
Hysteresis Loops ◽  
Weak Ferromagnetism ◽  
The Other ◽  
Zn Substitution ◽  
Other Hand ◽  
Three Samples ◽  
Ferromagnetic Hysteresis

We have studied the effect of Zn substitution for Cu, on the superconducting (SC) and magnetic properties of RuSr 2 Eu 2-x Ce x( Cu 1-x Zn x)2 O 10 (Ru-1222) for x = 0, 0.01 and 0.025. Similar to all other Zn doped HTSC materials, Zn reduces TC, from TC = 38 to 26 K for x = 0 and 0.01 respectively. The system with x = 0.025 is not SC down to 4.2 K. On the other hand, the magnetic state of the Ru sublattice is not significantly affected by the presence or absence the SC State. Thus, the two states are practically decoupled. The wide ferromagnetic hysteresis loops which open at 5 K close themselves at elevated temperatures and the remanent magnetizations (Mrem) and the coercive fields (HC) become zero around Tirr = 80 K . Surprisingly, at Tirr < T < TM a reappearance of the Mrem and HC (with a peak at 120 K) is observed for all three samples studied. We argue that the Ru-1222 system becomes (i) Anti-ferromagnetically (AFM) ordered at TM. (ii) At Tirr < TM, weak-ferromagnetism (W–FM) is induced by the canting of the Ru moments. (iii) At TC (TM/TC ~ 4), the system becomes SC and both SC and W–FM states coexist.

Growth of La1-xBaxCoO3 Single Crystals and their Structural and Magnetic Properties

2013 ◽  
Vol 596 ◽  
pp. 26-30
Author(s):  
Toru Kyomen ◽  
Takumi Nozawa ◽  
Minoru Hanaya
Keyword(s):  
Magnetic Properties ◽  
Magnetic Anisotropy ◽  
Single Crystals ◽  
Gas Flow ◽  
Magnetocrystalline Anisotropy ◽  
Hysteresis Loops ◽  
Mixed Gas ◽  
Twin Boundaries ◽  
Structural And Magnetic Properties

La1-xBaxCoO3single crystals were grown from KOH melt at 873 K under H2O/O2mixed gas flow. The grown crystals had a parallelepiped form with the edges of about 60 μm. Streaks indicating twin boundaries were observed on the surface planes of the crystals. The crystals showed magnetic anisotropy and anomalousMHhysteresis loops. The magnetocrystalline anisotropy and coupling of ferroelasticity and ferromagnetism were discussed based on the magnetic properties.

MAGNETIC MEASUREMENTS OF HIGH QUALITY SINGLE CRYSTAL YBa2Cu3O7-δ

2000 ◽  
Vol 14 (29n31) ◽  
pp. 3697-3702
Author(s):  
A. TIRBIYINE ◽  
A. TAOUFIK ◽  
S. SENOUSSI
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Single Crystals ◽  
Applied Magnetic Field ◽  
Magnetic Measurements ◽  
Hysteresis Loops ◽  
High Quality ◽  
Flux Lines ◽  
Magnetization Hysteresis ◽  
Irreversible Magnetization

We have investigated the magnetic measurements on high quality single crystals of YBa 2 Cu 3 O 7-δ. Several magnetization hysteresis loops have been obtained for different temperature values, and as a function of the angle θ between the direction of the applied magnetic field and the c-axis of the sample. Measurements were performed at magnetic field up to 6 Tesla and various temperatures between 10 and 90 K. Magnetization hysteresis loops scale and shape are strongly dependent on the temperature values. Our results show that the magnetic properties are profoundly affected by flux lines pinning. The irreversible magnetization decreases as the applied magnetic field deviates from the c-axis (θ increases).

High-Pressure Synthesis, Crystal Structures, and Magnetic Properties of 5d Double-Perovskite Oxides Ca2MgOsO6 and Sr2MgOsO6

2015 ◽  
Vol 54 (7) ◽  
pp. 3422-3431 ◽  
Author(s):  
Yahua Yuan ◽  
Hai L. Feng ◽  
Madhav Prasad Ghimire ◽  
Yoshitaka Matsushita ◽  
Yoshihiro Tsujimoto ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
Crystal Structures ◽  
Double Perovskite ◽  
Perovskite Oxides ◽  
High Pressure Synthesis ◽  
Pressure Synthesis

scholarly journals Cationic Ordering and Magnetic Properties of Re-Based Double Perovskite Oxides

2015 ◽  
Vol 21 (S3) ◽  
pp. 125-126
Author(s):  
Si-Young Choi ◽  
Minseok Choi ◽  
Sung-Dae Kim ◽  
Hyung Jeen Jeen ◽  
Young-Mok Rhyim
Keyword(s):  
Magnetic Properties ◽  
Double Perovskite ◽  
Perovskite Oxides

Anisotropic Magnetization in Single Crystal YBa2Cu3O7

1987 ◽  
Vol 01 (02) ◽  
pp. 401-408 ◽  
Author(s):  
R.N. Shelton ◽  
R.W. McCallum ◽  
M.A. Damento ◽  
K.A. Gschneidner
Keyword(s):  
Magnetic Properties ◽  
Transition Temperature ◽  
Critical Temperature ◽  
Critical Current Density ◽  
Single Crystal ◽  
Single Crystals ◽  
Current Density ◽  
Applied Field ◽  
Hysteresis Loops ◽  
Anisotropic Magnetization

Magnetization measurements on single crystals of YBa2Cu3O7 are used to study the anisotropy of the critical current density and magnetic properties of this superconducting oxide with a transition temperature of 88 K. Anisotropy of the magnetization versus applied field hysteresis loops is pronounced, with the effect increasing as the temperature approaches the superconducting critical temperature.

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