A5102979601- Magnetic and transport properties of perovskites and related materials
- Shape Memory Alloy Transformations
- Heusler alloys: electronic and magnetic properties
- Rare-earth and actinide compounds
- Magnetic Properties of Alloys
- Magnetic Properties and Applications
- Iron-based superconductors research
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- Thermal Expansion and Ionic Conductivity
- Inorganic Chemistry and Materials
- Multiferroics and related materials
- Advanced Thermoelectric Materials and Devices
- Physics of Superconductivity and Magnetism
- High Entropy Alloys Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Superconductivity in MgB2 and Alloys
- Intermetallics and Advanced Alloy Properties
- Electronic and Structural Properties of Oxides
- Advanced Welding Techniques Analysis
- Metallurgical and Alloy Processes
- MXene and MAX Phase Materials
- Creativity in Education and Neuroscience
- Diamond and Carbon-based Materials Research
- Semiconductor materials and interfaces
Louisiana State University
2016-2025
Southern Illinois University Carbondale
2008-2022
Federal Institute for Geosciences and Natural Resources
2020
Lomonosov Moscow State University
2015-2017
University of Nebraska–Lincoln
2000-2016
University of Nebraska at Omaha
2016
University of Northern Colorado
2012
United States Naval Research Laboratory
1999-2003
University of North Dakota
2002
Tulane University
1997-2000
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Mahmud Khan, Igor Dubenko, Shane Stadler, Naushad Ali; Exchange bias behavior in Ni–Mn–Sb Heusler alloys. Appl. Phys. Lett. 13 August 2007; 91 (7): 072510. https://doi.org/10.1063/1.2772233 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar...
We present the magnetocaloric properties of substituted Heusler alloy Ni2Mn1−xCuxGa, which shows a maximum magnetic entropy change ΔSM≈−64J∕KgK=−532mJ∕cm3K at 308K for field ΔH=5T. The dependence ΔSM on ΔH is approximately linear and does not reach saturation 5T. It demonstrated that temperature occurs can be tuned through subtle variations in composition.
The magnetocaloric properties of polycrystalline Ni50Mn50−xInx (15⩽x⩽16) associated with the second order magnetic transition at Curie temperature and first martensitic were studied using magnetization measurements. refrigeration capacity entropy change found to depend on In concentration reach a maximum value 280J∕kg −6.8J∕kgK 318K for field 5T. These values parameters are comparable that largest reported near metallic magnets room temperature.
A study of the magnetocaloric effect (MCE) in ferromagnetic Heusler alloys Ni50Mn37+xSb13−x (x=0,0.5,1) has been carried out through magnetization measurements. An inverse was observed vicinity first order martensitic transition. maximum positive magnetic entropy change ΔSm≈19J∕kgK at approximately 297K for a field 5T observed. It is demonstrated that transformation temperature, and corresponding ΔSm, can be tuned slight variation composition.
An experimental study on the exchange bias properties of bulk polycrystalline Ni50Mn50−xSnx Heusler alloys has been performed. Martensitic transformations have observed in for some critical Sn concentrations. The alloys, while their respective martensitic phases, are found to exhibit effect. Shifts hysteresis loops up 225Oe were 50kOe field cooled samples. behavior is attributed coexistence antiferromagnetic and ferromagnetic interactions system.
Magnetic and structural transitions were found to coincide by substituting Cu for Mn in Mn1−xCuxCoGe, leading a giant magnetocaloric effects associated with the first-order magnetostructural phase transition from ferromagnetic paramagnetic state. Maximum magnetic entropy changes of −ΔSM = 52.5 53.3 J/kg K field change ΔH 5 T have been observed at 302 316 K, x 0.080 0.085, respectively. The tunable temperatures through subtle variations composition make this system promising room-temperature...
By means of alloying appropriate amounts MnNiSi and MnFeGe, materials are found that undergo a paramagnetic to ferromagnetic transition close room temperature, accompanied by huge volume change. Thanks this change, application moderate pressures leads remarkable enhancement the magnetocaloric response. Work like may open new opportunities in development solid-state magnetic refrigeration devices.
The structural and magnetic properties of Ni(50)Mn(25+x)Sb(25-x) (0≤x≤18) Heusler alloys have been investigated by x-ray diffraction, magnetization, thermal expansion, electrical resistivity measurements. Austenitic phases with the L2(1) cubic crystal cell martensitic Pmm2 orthorhombic structures observed at room temperature in 0≤x≤12.5 13≤x≤14, respectively. Curie temperatures austenitic decrease linearly increasing x change from 370 (x = 0) to 340 K 12.5). In concentration 7<x≤10, system...
The thermomagnetic and magnetocaloric properties of the MnNiGe1−xAlx system have been investigated by magnetization differential scanning calorimetry (DSC) measurements. presence first-order magnetostructural transitions (MSTs) from hexagonal ferromagnetic to orthorhombic antiferromagnetic phases has detected for x = 0.085 0.09 at 193 K 186 K, respectively. values latent heat (L 6.6 J/g) corresponding total entropy changes (ΔST 35 J/kg K) evaluated MST (x 0.09) DSC magnetic change (ΔSM 17.6...
(MnNiSi)1−x(FeCoGe)x undergoes a magnetostructural phase transition near room temperature that is acutely sensitive to applied hydrostatic pressure, which presents as marked shift in the martensitic (TM) by about –7.5 K/kbar. The can therefore be induced pressure or magnetic field. barocaloric and magnetocaloric effects were measured across TM (for sample with x = 0.38), corresponding entropy changes +74 J/kg K (P 2.7 kbar) –58 (μ0 H 5 T), respectively. It was observed change increases...
The unoccupied electronic structure for the ${\mathrm{Sr}}_{14}{\mathrm{Cu}}_{24}{\mathrm{O}}_{41}$ family of two-leg ladder compounds was investigated different partial substitutions ${\mathrm{Sr}}^{2+}$ by ${\mathrm{Ca}}^{2+},$ leaving nominal hole count constant, and ${\mathrm{Y}}^{3+}$ or ${\mathrm{La}}^{3+},$ reducing from its full value 6 per formula unit. Using polarization-dependent x-ray absorption spectroscopy on single crystals, states both chain sites could be studied. While...
We present experimental results on the giant Hall effect in Heusler alloy ${\text{Ni}}_{50}{\text{Mn}}_{50\ensuremath{-}\text{x}}{\text{In}}_{\text{x}}$ with $x=15.2$. An unusual field dependence of resistivity $({\ensuremath{\rho}}_{H})$ was observed vicinity martensitic phase transition, where ${\ensuremath{\rho}}_{H}$ sharply increases up to $(15\text{ }\text{kOe})=50\text{ }\ensuremath{\mu}\ensuremath{\Omega}\text{ }\text{cm}$. This value is comparable magnetic nanogranular alloys....
The structural and magnetic transitions in the shape-memory alloy ${\text{Ni}}_{2}\text{MnGa}$ can be tuned as a function of temperature by adding dopants. By altering free energy such that coincide, giant magnetocaloric effect is created near room temperature. We show, using x-ray absorption spectroscopy circular dichroism, how Cu, substituted for Mn, pulls transition downward also, counterintuitively, increases delocalization Mn magnetism. At same time, this reinforces Ni-Ga chemical bond,...
Room temperature x-ray diffraction, dc magnetization, and ac susceptibility measurements have been performed on a series of Mn rich Ni50Mn37-xCrxSb13 Ni50+xMn37-xSb13 Heusler alloys. Depending the value x, room crystal structures samples are either L21 cubic or orthorhombic. It is commonly accepted idea that martensitic transition temperatures in Ni-Mn-Z (Z = Ga, In, Sb, Sn) based alloys decrease (increase) with decreasing (increasing) valence electron concentration, e/a. However, present...
The isostructural alloying of two compounds with different magnetic and thermo-structural properties has resulted in a new system, (MnNiSi)1−x(FeCoGe)x, that exhibits large magnetocaloric effects acute sensitivity to both compositional variation applied hydrostatic pressure. maximum isothermal entropy change reaches value −ΔSmax = 143.7 J/kg K for field ΔB 5 T at atmospheric first-order magnetostructural transition responsible the shifts lower temperature pressure (∼−10 K/kbar) but maintains −ΔSmax.
In Ni2MnGa (cubic structure of L21 type) a first order martensitic structural transition, from the parent cubic (austenitic) phase to low temperature complex tetragonal structure, takes place at TM=202K, and ferromagnetic in austenitic sets TC=376K. this work, Mn sites have been partially substituted with magnetic Co nonmagnetic Cu, influence these substitutions on properties Ni2Mn1−xMxGa (M=Co Cu) studied by XRD magnetization measurements. X-ray diffraction patterns indicate that doped...
The magnetocaloric and thermomagnetic properties of the MnNiGe1−xAlx system have been studied by temperature-dependent x-ray diffraction, differential scanning calorimetry (DSC), magnetization measurements. partial substitution Al for Ge in results a first order magnetostructural transition (MST) from hexagonal ferromagnetic to an orthorhombic antiferromagnetic phase at 186 K (for x = 0.09). A large magnetic entropy change ΔSM −17.6 J/kg ΔH 5 T was observed vicinity TM 0.09. value is...