Crystallographic aspects of L10 magnetic materials

Laughlin, David E.; Srinivasan, Kumar; Tanase, M.; Wang, Lisha

doi:10.1016/j.scriptamat.2005.04.039

Cited by 95 publications

(54 citation statements)

References 6 publications

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“…The existence of the bct phase can be considered as a reason for all the structural peculiarities of the L1 0 alloys that were reported in earlier papers [7][8][9][10][11][12][13][14]20,[22][23][24][52][53][54][55]. Among them one can pick out: (1) the difference in the c/a ratio determined from the fundamental and superlattice reflections [7]; (2) the existence of inequality c/a -1 in the case of unsplit reflections (i.e.…”

Section: Resultsmentioning

confidence: 98%

“…It is experimentally shown that variation of temperature and duration of the ordering annealing and application of magnetic field or stresses in the course of this annealing, as well as of preliminary plastic deformation, are factors that exert a significant effect on the integral degree of long ordering, morphology and sizes of the meso-and microstructure elements of L1 0 alloys [7][8][9][10][11][12][13][14]. In the majority of theoretical and experimental works (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…In the majority of theoretical and experimental works (e.g. [4][5][6][7][8][9][10][11][12][13][14][15]) the tetragonal distortion of the crystal lattice, which arises in the alloys upon the phase transformation A1 ! L1 0 , is considered to result exclusively from layer-by-layer distribution of atoms of different kinds in the directions h100i (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Discovery of metastable tetragonal disordered phase upon phase transitions in the equiatomic nanostructured FePd alloy

et al. 2013

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Specific features of the phase transformation A1 ! L1 0 (space groups Fm3m and P4/mmm, respectively) in single crystals of the equiatomic alloy FePd subjected to annealings both in the absence and in the presence of external uniaxial load, as well as in polycrystalline samples that had undergone severe plastic deformation via high-pressure torsion and subsequent annealing, have been studied. An investigation of the single crystals in a nanostructured state formed at different stages of ordering annealing was performed using optical polarization, thermomagnetic and transmission electron microscopy (TEM) methods. The nanostructured state of the polycrystalline samples FePd after deformation of both disordered and ordered FePd alloys and subsequent annealing was examined with the help of TEM and X-ray techniques. The results obtained were analyzed based on the known concepts of the symmetry theory of phase transitions. It was concluded that the atomic ordering in the FePd alloys is preceded by the formation of a ferroelastic disordered bodycentered tetragonal phase with the structural type A6 and the space group I4/mmm. Experimental data that evidence the existence of a tetragonal disordered phase both in the single crystals and in the polycrystalline samples of FePd after severe plastic deformation and subsequent annealing are reported. Thus, the A1 M A6 M L1 0 phase transformation represents a combination of different types of phase transitions such as cooperative displacement A1 M A6 and ordering A6 M L1 0 of atoms.

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Discovery of metastable tetragonal disordered phase upon phase transitions in the equiatomic nanostructured FePd alloy

et al. 2013

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“…• C. Usually such annealing temperature is sufficient [9,10] to fabricate the chemically ordered L1 0 alloy, but is not large enough to produce the alloy with a (001) texture, which is needed to obtain perpendicular magnetic anisotropy. To reduce the temperature of L1 0 structure formation and to induce (001) texture the FePd alloy was doped with Cu, as it was observed in our previous studies.…”

Section: Introductionmentioning

confidence: 99%

Determination of grain shape of laser-irradiated FePdCu thin alloy films

Perzanowski

Krupiński

Zarzycki

et al. 2014

Applied Surface Science

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The irradiation with the 10 ns pulsed infrared Nd:YAG laser was applied to transform FePdCu multilayers into chemically ordered L1 0 phase. The X-ray diffraction methods (Θ/2Θ scan, ψ-scan, ω-scan) were used to trace the presence of L1 0 phase after laser annealing with different number of pulses. The size and shape of crystallites was determined depending on their orientation with respect to film plane. The (111) oriented crystallites of constituent metals were built as coherent domains spreading through multilayers during deposition of films. Laser annealing induced the transformation of multilayers to alloy, and the ordering of (111) oriented crystallites. Simultaneously, the (002) oriented crystallites appeared confirming the transformation to L1 0 alloy.

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“…Other systems based on the CuAl prototype, such as iron-platinum (FePt) and iron-palladium (FePd), are important for both their structurally and magneti-cally anisotropic properties and for application in magnetic recording [15]. L1 0 compounds can be structurally equivalent to the face-centered cubic lattice when the a and c axes have the same magnitude but the occupancy of the faces and the corners are separately and not statistically defined, thus reducing the highest symmetry from cubic to tetragonal.…”

Section: Heuslersmentioning

confidence: 99%

Magnetic spectroscopy and microscopy of functional materials

Jenkins

2011

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Mainz, 2011 SummaryHeusler intermetallics Mn 2 Y Ga and X 2 MnGa (X, Y =Fe, Co, Ni) undergo tetragonal magnetostructural transitions that can result in half metallicity, magnetic shape memory, or the magnetocaloric effect. Understanding the magnetism and magnetic behavior in functional materials is often the most direct route to being able to optimize current materials for todays applications and to design novel ones for tomorrow.Synchrotron soft x-ray magnetic spectromicroscopy techniques are well suited to explore the the competing effects from the magnetization and the lattice parameters in these materials as they provide detailed element-, valence-, and site-specific information on the coupling of crystallographic ordering and electronic structure as well as external parameters like temperature and pressure on the bonding and exchange.Fundamental work preparing the model systems of spintronic, multiferroic, and energy-related compositions is presented for context. The methodology of synchrotron spectroscopy is presented and applied to not only magnetic characterization but also of developing a systematic screening method for future examples of materials exhibiting any of the above effects.

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Crystallographic aspects of L10 magnetic materials

Cited by 95 publications

References 6 publications

Discovery of metastable tetragonal disordered phase upon phase transitions in the equiatomic nanostructured FePd alloy

Discovery of metastable tetragonal disordered phase upon phase transitions in the equiatomic nanostructured FePd alloy

Determination of grain shape of laser-irradiated FePdCu thin alloy films

Magnetic spectroscopy and microscopy of functional materials

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