Development of half-metallic ultrathin Fe3O4 films for spin-transport devices

Soeya, Susumu; Hayakawa, Jun; Takahashi, Hiromasa; Ito, K.; Yamamoto, C.; Kida, A.; Asano, Hidefumi; Matsui, Masanao

doi:10.1063/1.1446995

Cited by 193 publications

(81 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among these, magnetite (Fe 3 O 4 ) is an important magnetic material having cubic inverse spinel structure in which Fe cations occupying the interstitial tetrahedral position and oxygen forms FCC closed packing [4]. The electronic transitions can occur between Fe 2+ and Fe 3+ ions in the octahedral sites at room temperature, making magnetite an important kind of semi-metallic material [5,6]. One of the principal fact in the iron-containing nanoparticles is an existence of different configuration states of iron which determine their specific properties [7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of magnetite nanocrystals

Raja

Verma

Karmakar

et al. 2011

Cryst. Res. Technol.

View full text Add to dashboard Cite

Nanocrystals of magnetite (Fe 3 O 4 ) were prepared by sol-gel technique. The prepared nanocrystals were characterized for phase by powder X-ray diffraction (XRD) of the samples annealed at successively higher temperature. The magnetite phase was formed during the annealing of the synthesized powder at 400 °C for a few hours. The Fourier transform infrared spectroscopy (FTIR) was performed to analyze the functional groups in the material. The energy dispersive X-ray diffraction (EDAX) was performed for chemical composition analysis. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques were used to analyze the morphology of nanocrystals and for estimating their average size. The results confirm the formation of Fe 3 O 4 nanocrystals of the sizes ~20-50 nm.

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of magnetite nanocrystals

Raja

Verma

Karmakar

et al. 2011

Cryst. Res. Technol.

View full text Add to dashboard Cite

show abstract

“…Since de Groot et al's discovery [1] in 1983, many HM ferromagnets have been theoretically predicted and some of them have been confirmed experimentally in ferromagnetic metallic oxides such as Fe 3 O 4 [2,3] and CrO 2 [4,5]. Although many transition-metal pnictides and chalcogenides with zinc-blende (ZB) structure have been extensively investigated, however, it is highly desirable to explore new half-metallic ferromagnetic materials, which are more promising for applications.…”

mentioning

confidence: 98%

Half‐metallic ferromagnetism in wurtzite SrC

Zhang¹,

Yan²,

Li³

2008

Physica Status Solidi (b)

View full text Add to dashboard Cite

The first‐principles full potential linearized augmented plane‐wave method within density‐functional theory is used to investigate electronic structure and magnetism of wurtzite (WZ) crystal structure SrC. It is shown that the WZ SrC is a true half‐metallic ferromagnet with a magnetic moment of 2μB per formula unit. The large HM gaps (0.72 eV) and robustness of half‐metallicity with respect to the lattice change make it possible candidate grown epitaxially on appropriate substrates in the form of films thick enough, and therefore should be useful in spintronics and other related applications. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

“…Half-metallic and ferromagnetic properties are widely found in perovskite compounds, 5,6 metallic oxides, 7,8 HAs, 9,10 and magnetic semiconductors. 11,12 Amongst all systems, HAs are most favorable because of their high Curie temperatures and spin polarization along with the structural compatibility to the conventional wide-gap semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Half-metallic Co-based quaternary Heusler alloys for spintronics: Defect- and pressure-induced transitions and properties

et al. 2016

View full text Add to dashboard Cite

Heusler compounds offer potential as spintronic devices due to their spin-polarization and halfmetallicity properties, where electron spin-majority (minority) manifold exhibits states (band gap) at the electronic chemical potential, yielding full spin-polarization in a single manifold. Yet, Heuslers often exhibit intrinsic disorder that degrades its half-metallicity and spin-polarization. Using densityfunctional theory, we analyze the electronic and magnetic properties of equiatomic Heusler (L21) CoMnCrAl and CoFeCrGe alloys for effects of hydrostatic pressure and intrinsic disorder (thermal antisites, binary swaps, and vacancies). Under pressure, CoMnCrAl undergoes a metallic transition, while half-metallicity in CoFeCrGe is retained for a limited range. Antisite disorder between Cr-Al pair in CoMnCrAl alloy is energetically the most favorable, and retain half-metallic character in Crexcess regime. However, Co-deficient samples in both alloys undergo a transition from half-metallic to metallic, with a discontinuity in the saturation magnetization. For binary swaps, configurations that compete with the ground state are identified and show no loss of half-metallicity; however, the minority-spin bandgap and magnetic moments vary depending on the atoms swapped. For single binary swaps, there is a significant energy cost in CoMnCrAl but with no loss of half metallicity. Although a few configurations in CoFeCrGe energetically compete with the ground state, however the minority-spin bandgap and magnetic moments vary depending on the atoms swapped. These informations should help in controlling these potential spintronic materials.PACS numbers: 31.15. 75.50.Cc,

show abstract

Development of half-metallic ultrathin Fe3O4 films for spin-transport devices

Cited by 193 publications

References 11 publications

Synthesis and characterization of magnetite nanocrystals

Synthesis and characterization of magnetite nanocrystals

Half‐metallic ferromagnetism in wurtzite SrC

Half-metallic Co-based quaternary Heusler alloys for spintronics: Defect- and pressure-induced transitions and properties

Contact Info

Product

Resources

About