The structure, intrinsic magnetic properties, and magnetic hardening of L1-Mn1.15Ga alloy

Li, C.H.; Lu, Qingmei; Zhang, H.G.; Yue, Ming; Wang, M.L.; Zhang, D.T.; Liu, D.M.; Huang, Zhipei

doi:10.1016/j.jallcom.2016.11.283

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…It can be seen that the most stable MM-MS_B interface in D0 22 -MS/CMS and L1 0 -MS/CMS bilayers has Curie temperature above the ambient temperature, and moreover, the latter one (L1 0 -MG/CMS) has slightly higher Curie temperature than the former one (D0 22 -MS/CMS). As a comparison, we also estimate the spin exchange parameters and Curie temperature for D0 22 -MG, L1 0 -MG and CMS bulks in the same approximation, the obtained exchange parameters are 113, 29.0 and 151 meV, and the corresponding Curie temperature are 875, 213 and 1170 K, while experimental Curie temperatures are about 770 5 , above 300 48 and 985 K 17 , 19 for D0 22 -MG, L1 0 -MG and CMS bulks, respectively. Obviously, the MM-MS_B interface has the lower Curie temperatures than D0 22 -MG and CMS bulks for the D0 22 -MG/CMS bilayer, while it’s Curie temperature is between L1 0 -MG and CMS bulks for L1 0 -MG/CMS bilayer.…”

Section: Resultsmentioning

confidence: 99%

Structural, electronic and magnetic properties of MnxGa/Co2MnSi (x = 1, 3) bilayers

Chen

Wang

Cheng

et al. 2018

Sci Rep

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Directly coupled hard and soft ferromagnets were popularly used as the hybridized electrodes to enhance tunnel magnetoresistance (TMR) ratio in the perpendicular magnetic tunnel junction (pMTJ). In this paper, we employ the density functional theory (DFT) with general gradient approximation (GGA) to investigate the interfacial structure and magnetic behavior of tetragonal Heusler-type MnGa (MG)/L21-Co2MnSi (CMS) Heusler alloy bilayers with the MnGa being D022-MnGa alloy (Mn3Ga) and L10-MnGa alloy (MnGa). The MM-MS_B interface with the bridge (B) connection of MnMn termination (MM) of D022- and L10-MnGa layers to MnSi termination (MS) of CMS layers is found to be most stable in the energy point of view. Also, a strong antiferromagnetic coupling and relatively higher spin polarization can be observed in the MM-MS_B interface. Further, a remarkable potential difference to derive electrons to transfer from MG layer to CMS layer appears at the interface. These theoretical results indicate that the MG/CMS bilayers are promising candidates as coupled composites, and moreover, the D022-MG/CMS bilayer is better than L10-MG/CMS bilayer due to its larger spin polarization and built-in field at the interface.

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Section: Resultsmentioning

confidence: 99%

Structural, electronic and magnetic properties of MnxGa/Co2MnSi (x = 1, 3) bilayers

Chen

Wang

Cheng

et al. 2018

Sci Rep

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“…The M r and M s of the L1 0 -Mn 1+x Ga powders decrease slightly after ball-milling. A coercivity up to 0.96 T is measured for the ball-milled L1 0 -powders at 5 K. The coercivity of our sample is larger than that of the L1 0 -Mn 1.15 Ga alloys prepared by induction melting followed by annealing and ball milling, 6 owing to the smaller crystalline size of our samples. However, the M s of the L1 0 -Mn 1+x Ga powders is lower than that of the bulk samples, 6 owing to the presence of a large amount of uncompensated surface spins in the powder samples.…”

Section: -4 Si Et Almentioning

confidence: 68%

“…The Curie temperature (T c ) of the ball-milled L1 0 -Mn 1.5 Ga is measured to be ∼650 K, which is slightly higher than the T c =595 K of the Mn 1.15 Ga ingots. 6 There are two transition temperatures in the M-T curves of the Mn 23 Ga 77 sample. The magnetization decrement at temperatures around 430 K was ascribed to the magnetic transition of ϕ-phase, which has a T c around 463 K. 1 The magnetic transition of Mn 23 Ga 77 sample at ∼650 K originates from the L1 0 -Mn 1+x Ga phase presents in the sample.…”

Section: -4 Si Et Almentioning

confidence: 98%

“…The bulk samples of L1 0 -MnGa phase with high saturation magnetization were usually prepared by melting the ingots followed by annealing and/or quenching process. 6,7 The growth and characterizations of the L1 0 -MnGa films have been extensively studied since the observation of the square perpendicular hysteresis of Mn x Ga (1.2<x<1.5) films in 1990s. 3,8,9 The L1 0 -MnGa microparticles with size in the range of 10-50 µm had been prepared by high energy ball milling and subsequent annealing.…”

Section: Introductionmentioning

confidence: 99%

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Structure and magnetic properties of L1-MnGa nanoparticles prepared using direct reactions between Mn nanoparticles and Ga

et al. 2018

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The tetragonal L10-Mn1+xGa (x<0.8) nanoparticles and bcc-Mn23Ga77 nanoparticles with large coercivity were prepared using direct reactions between Mn nanoparticles and Ga at elevated temperatures. The Mn23Ga77 phase was formed at ∼573 K while the L10-structured Mn1+xGa was formed at ∼850 K. After ball-milling, the L10-Mn1+xGa nanoparticles transformed into nano-flakes with enhanced coercivity. The size of the as-prepared Mn23Ga77 nanoparticles is comparable to that of the precursor Mn nanoparticles. An aggregation of the nanoparticles and thus a larger particle size were observed in the L10-Mn1+xGa nanoparticles obtained at 850 K. The size of the L10-Mn1+xGa nano-flakes is reduced to about 200-400 nm with a thickness of ∼20 nm. The coercivity of the Mn23Ga77 nanoparticles and the L10-Mn1+xGa nanoparticles at 300 K reached up to 0.2 T and 0.43 T, respectively. The coercivity of L10-Mn1+xGa ball-milled nano-flakes is 0.59 T at 300 K.

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“…A more slowly ordering counterpart to MnAl is MnGa. [ 25 ] The MnGa system is less well understood than the other three mentioned systems. It is hard to study experimentally and there is not yet consensus about its exact binary phase diagram.…”

Section: Introductionmentioning

confidence: 99%

Atomic Migration and Ordering of Binary Ferromagnetic Intermetallic L1₀Phases and Influences of Alloying Elements and Electric Fields

2023

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The ordered body‐centered tetragonal intermetallic phase of FeNi is a promising candidate for high‐performance permanent magnets without rare‐earth elements. However, on earth FeNi is found naturally only in the disordered face‐centered‐cubic A1 phase. Herein, the atomic migration and ordering processes in binary intermetallic phases are investigated within the framework of density‐functional theory. The main objectives are 1) to develop a thorough understanding of the thermally activated diffusion processes at the atomic scale and 2) to make a critical assessment in how far electric field and current effects can be effective means for an enhanced hardening‐by‐ordering of disordered, soft‐ferromagnetic alloys. The scope is extended from FeNi to the hard‐ferromagnetic phases of FePt, FePd, MnAl, and MnGa as well as ternary Fe(Pt,Ni) alloys. These materials cover a wide range of thermal‐ordering time scales and related experimental feasibility.

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The structure, intrinsic magnetic properties, and magnetic hardening of L1-Mn1.15Ga alloy

Cited by 6 publications

References 17 publications

Structural, electronic and magnetic properties of MnxGa/Co2MnSi (x = 1, 3) bilayers

Structural, electronic and magnetic properties of MnxGa/Co2MnSi (x = 1, 3) bilayers

Structure and magnetic properties of L1-MnGa nanoparticles prepared using direct reactions between Mn nanoparticles and Ga

Atomic Migration and Ordering of Binary Ferromagnetic Intermetallic L1₀Phases and Influences of Alloying Elements and Electric Fields

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The structure, intrinsic magnetic properties, and magnetic hardening of L1-Mn1.15Ga alloy

Cited by 6 publications

References 17 publications

Structural, electronic and magnetic properties of MnxGa/Co2MnSi (x = 1, 3) bilayers

Structural, electronic and magnetic properties of MnxGa/Co2MnSi (x = 1, 3) bilayers

Structure and magnetic properties of L1-MnGa nanoparticles prepared using direct reactions between Mn nanoparticles and Ga

Atomic Migration and Ordering of Binary Ferromagnetic Intermetallic L10Phases and Influences of Alloying Elements and Electric Fields

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Atomic Migration and Ordering of Binary Ferromagnetic Intermetallic L1₀Phases and Influences of Alloying Elements and Electric Fields