Simple rules for the understanding of Heusler compounds

Graf, Tanja; Felser, Claudia; Parkin, S. S. P.

doi:10.1016/j.progsolidstchem.2011.02.001

Cited by 1,958 publications

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“…This interest is due to the extremely varied physical properties that can be found within this class of materials. 7 Alloys showing ferromagnetism and ferrimagnetism are readily obtained both in bulk and thin film forms. Furthermore, semiconducting 8 and insulating materials can also be synthesized, as well as materials with more exotic properties like superconductors and topological insulators.…”

Section: Introductionmentioning

confidence: 99%

Site-specific order and magnetism in tetragonal Mn3Ga thin films

et al. 2013

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Mn 3 Ga bulk material and thin films deposited on several different substrates have been investigated using x-ray and neutron diffraction, x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and electronic structure calculations using density-functional theory with the aim of determining the atomic site occupancy, magnetic moments, and magnetic structure of this tetragonal D0 22 -structure compound. The Mn 3 Ga has close to ideal site occupancy, with Ga on 2a sites and Mn on 2b and 4d sites. The magnetic structure is basically ferrimagnetic, with the larger Mn moment of about 3 μ B on the 2b site, which is coordinated by 8 Mn 4d and 4 Ga, and the smaller one on the 4d site, which is coordinated by 4 Mn 2b, 4 Ga, and 4 Mn 4d. The Mn d-band occupancy is close to 5 on both sites, and the orbital moments are small, <0.2 μ B . The material nevertheless exhibits substantial uniaxial anisotropy, K u = 1.0 MJ m −3 , which originates from the 4d site. The 2b site has hard axis anisotropy, which together with an oscillatory exchange coupling from the first and second nearest neighbors, leads to a soft component of the magnetization in the c plane, coexisting with c-axis hysteresis loops exhibiting coercivity of up to 1.2 T, and magnetization in the range 110-220 kA m −1 at room temperature, depending on preparation conditions. Tetragonal Mn 2 Ga films behave similarly. Manganese is lost from both sites, but the films have substantially larger magnetization (480 kA m −1 ) and anisotropy constant (2.35 MJ m −3 ) than Mn 3 Ga.

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Section: Introductionmentioning

confidence: 99%

Site-specific order and magnetism in tetragonal Mn3Ga thin films

et al. 2013

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“…A more detailed description of the basic understanding of Heusler compounds is given in Ref. 4. The goal of the article is to discuss future prospective of the unique family of magnetic compounds.…”

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“…A good starting point is the Nowotny-Juza phases, which are relatives of the Heusler compounds. 4 This closely related set of compounds with the formula LiYZ has 3 interpenetrating fcc lattices and the sum of the valence electrons is eight, just like the binary semiconductors. The Z atom is always a nonmagnetic semiconducting or metallic element just as in the Heusler compounds.…”

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Basics and prospective of magnetic Heusler compounds

et al. 2015

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“…"You really learn to think differently," she says. In 2011, the couple published a paper 3 on Heusler compounds and their potential in spintronics, a discipline that makes use of electrical fields to manipulate the spin of electrons.…”

Section: Materials and Air Milesmentioning

confidence: 99%

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2014

Nature

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Simple rules for the understanding of Heusler compounds

Cited by 1,958 publications

References 407 publications

Site-specific order and magnetism in tetragonal Mn3Ga thin films

Site-specific order and magnetism in tetragonal Mn3Ga thin films

Basics and prospective of magnetic Heusler compounds

Love in the lab: Close collaborators

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