scholarly journals Role of stoichiometric and nonstoichiometric defects on the magnetic properties of the half-metallic ferromagnet NiMnSb

2006 ◽  
Vol 73 (6) ◽  
Author(s):  
B. Alling ◽  
S. Shallcross ◽  
I. A. Abrikosov
Keyword(s):  
Magnetic Properties ◽  
Half Metallic ◽  
Metallic Ferromagnet

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.

Magnetic properties of the half-metallic ferromagnet NiMnSb grown on InSb by pulsed laser deposition

2004 ◽  
Vol 79 (4-6) ◽  
pp. 1211-1213 ◽  
Author(s):  
J. Androulakis ◽  
S. Gardelis ◽  
J. Giapintzakis ◽  
P.D. Buckle
Keyword(s):  
Magnetic Properties ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Half Metallic ◽  
Metallic Ferromagnet

Mxene Monolayer Mn2ZnN2: A Promising Robust Intrinsic Half-metallic Nanosheet

2021 ◽  
Author(s):  
Huang Cheng-Cai ◽  
Wang Yang ◽  
Yao Qian ◽  
Dengfeng Li ◽  
Liu Jun
Keyword(s):  
Magnetic Properties ◽  
Magnetic Moment ◽  
Electrode Materials ◽  
Energy Gap ◽  
Two Dimensions ◽  
Half Metallicity ◽  
Half Metallic ◽  
Spin Polarized ◽  
Metallic Ferromagnet ◽  
A Charge

Abstract Two-dimensions half-metallic ferromagnet is more promising in spintronics. In recent years, the half-metallicity and the magnetic properties of the Mxene materials have been the research hotspot of new materials due to their unique crystal characteristics and wide promising applications. In this paper, the geometric structure of the Mxene nanosheet Mn2ZnN2 was optimized, and then its electric and magnetic properties were studied by the first principles calculations. Results show that the Mxene nanosheet Mn2ZnN2 is possibly a kind of robust intrinsic half-metallic nanosheet with the integer magnetic moment 6.00 μB per unit. Its half-metallic character and the magnetic moment mainly come from the spin-polarized Mn-ions induced by the crystal field. If the absolute compression stain is lower 3.0 %, its half-metallicity remains well and the magnetic moment per unit is always 6.00 μB, indicating its half-metallicity and magnetic properties are stable to some extent. More importantly, removing an electron from this nanosheet, its magnetic moment per unit increases from 6.00 μB to 9.00 μB and the half-metallic energy gap of its spin-down subband increase evidently, showing that removing a charge from the nanosheet may improve evidently its half-metallicity and magnetic properties. Therefore, this nanosheet may be one of preferred spintronic electrode materials.

scholarly journals Effect of (0001) Strain on the Electronic and Magnetic Properties of the Half-Metallic Ferromagnet Fe2Si

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Wang Chen ◽  
Ruijie Li ◽  
Yanhui Liu
Keyword(s):  
Magnetic Properties ◽  
Band Structure ◽  
Fermi Surface ◽  
Density Functional ◽  
Density Functional Theory Method ◽  
Half Metallic ◽  
Electronic And Magnetic Properties ◽  
Metallic Ferromagnet ◽  
Metallic Ferromagnetism ◽  
Half Metallic Ferromagnetism

The electronic and magnetic properties of the half-metallic ferromagnet Fe2Si under (0001) strain have been evaluated by the first-principles density functional theory method. The spin-up band structure shows that bulk Fe2Si has metallic character, whereas the spin-down band structure shows that bulk Fe2Si is an S-L indirect band gap of 0.518 eV in the vicinity of Fermi surface. Indirect-to-direct band gaps and an unstable-to-stable transition are observed in bulk Fe2Si as strain is applied. In the range −11% to 11% (excluding zero strain), bulk Fe2Si has stable half-metallic ferromagnetism, the spin polarization at the Fermi surface is 100%, and the magnetic moment of the Fe2Si unit cell is 4.0 μB. The density distribution shows that the spin states of bulk Fe2Si mainly come from the Fe1-3d and Fe3-3d states, indicating that bulk Fe2Si has spin-polarized ferromagnetism. The half-metallic ferromagnetism of bulk Fe2Si is mainly caused by d–d exchange and p–d hybridization, which are not sensitive to strain. It is very important to investigate the effect of changes in the lattice constant on the half-metallic ferromagnetic properties of bulk Fe2Si.

Magnetic Properties of xCeO2•(50 − x) PbO•50B2O3 Glasses and Glass Ceramics

2017 ◽  
Vol 13 (1) ◽  
pp. 4486-4494 ◽  
Author(s):  
G.El Damrawi ◽  
F. Gharghar
Keyword(s):  
Magnetic Properties ◽  
Large Scale ◽  
Glass Ceramics ◽  
Magnetic Behavior ◽  
Crystal Formation ◽  
Dual Roles ◽  
Effective Agent ◽  
Ordered Structures ◽  
Essential Change

Cerium oxide in borate glasses of composition xCeO2·(50 − x)PbO·50B2O3 plays an important role in changing both microstructure and magnetic behaviors of the system. The structural role of CeO2 as an effective agent for cluster and crystal formation in borate network is clearly evidenced by XRD technique. Both structure and size of well-formed cerium separated clusters have an effective influence on the structural properties. The cluster aggregations are documented to be found in different range ordered structures, intermediate and long range orders are the most structures in which cerium phases are involved. The nano-sized crystallized cerium species in lead borate phase are evidenced to have magnetic behavior.  The criteria of building new specific borate phase enriched with cerium as ferrimagnetism has been found to keep the magnetization in large scale even at extremely high temperature. Treating the glass thermally or exposing it to an effective dose of ionized radiation is evidenced to have an essential change in magnetic properties. Thermal heat treatment for some of investigated materials is observed to play dual roles in the glass matrix. It can not only enhance alignment processes of the magnetic moment but also increases the capacity of the crystallite species in the magnetic phases. On the other hand, reverse processes are remarked under the effect of irradiation. The magnetization was found to be lowered, since several types of the trap centers which are regarded as defective states can be produced by effect of ionized radiation. 

Temperature and field dependences of transverse relaxivity of Co–Zn ferrite nanoparticles coated with silica: The role of magnetic properties and different regimes

2021 ◽  
Vol 260 ◽  
pp. 124178
Author(s):  
Pavel Veverka ◽  
Lenka Kubíčková ◽  
Zdeněk Jirák ◽  
Vít Herynek ◽  
Miroslav Veverka ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ferrite Nanoparticles ◽  
Zn Ferrite

Role of Fe Doping on Local Structure and Electrical and Magnetic Properties of PbTiO3

2021 ◽  
Author(s):  
Hasitha Ganegoda ◽  
Soham Mukherjee ◽  
Beihai Ma ◽  
Daniel T. Olive ◽  
James H. McNeely ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Local Structure ◽  
Fe Doping ◽  
Electrical And Magnetic Properties
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