Induced Magnetic Moment in Ferromagnetic Fe Alloys by Tetragonally Elongated Lattice Expansion

Mitsuoka, K.; Miyajima, H.; Ino, Hiromitsu; Chikazumi, S.

doi:10.1143/jpsj.53.2381

Cited by 52 publications

(27 citation statements)

References 17 publications

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“…This is also the preferred position for carbon and nitrogen interstitial impurities, which have a similar atomic radii than boron. [24][25][26][27] Actually, in the amorphous alloys, the Fe bond lengths found in the magnetostrictive environment are those expected if these Fe atoms were nearest neighbors of a boron impurity at an octahedral site. This is shown in Fig.…”

Section: B Macroscopic Magnetostriction In Polycrystalline Fecobmentioning

confidence: 88%

“…It is known that other interstitial impurities of similar atomic radius than boron, like carbon and nitrogen, when entering the bcc Fe lattice cause an enhancement of the magnetic moment and anisotropy of the surrounding Fe atoms. [24][25][26][27][28] Actually, the enhancement of the magnetic anisotropy observed in FeB alloys has in some cases been explained assuming such a tetragonal distortion of the bcc Fe lattice by interstitial boron. 29 All this discussion conveys that a fundamental step for the understanding of the magnetostriction in these alloys is the identification of the atomic environments that generate it.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the magnetostrictive atomic environments in FeCoB alloys

et al. 2012

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The atomic environments of Fe and Co involved in the magnetostriction effect in FeCoB alloys have been identified by differential extended x-ray fine structure (DiffEXAFS) spectroscopy. The study, done in amorphous and polycrystalline FeCoB films, demonstrates that the alloys are heterogeneous and that boron plays a crucial role in the origin of their magnetostrictive properties. The analysis of DiffEXAFS in the polycrystalline and amorphous alloys indicates that boron activates magnetostriction when entering as an impurity into octahedral interstitial sites of the Fe bcc lattice, causing its tetragonal distortion. Magnetostriction would be explained then by the relative change in volume when the tetragonal axis of the site is reoriented under an externally applied magnetic field. The experiment demonstrates the extreme sensitivity of DiffEXAFS to characterize magnetostrictive environments that are undetectable in their related EXAFS spectra.

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Section: B Macroscopic Magnetostriction In Polycrystalline Fecobmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Determination of the magnetostrictive atomic environments in FeCoB alloys

et al. 2012

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“…A decrease in moment is likely to occur when non-polarizable p-d hybrid bonds are formed instead of the polarizable 3d transition metal states [37]. The situation on the Fe sites is more complex showing an increase in fcc FeAu [14], bcc Fe(Sn, Sb, Ga, As, Ge) [37] and NiFe/Pt [13] that is attributed to volume expansion of the unit cell associated with the addition of the larger atoms [37,39]. This interpretation also applies to the lattice contractions found with the addition of smaller adatoms such as in bcc FeB [40] and Fe(V/Cr) [41,42] that leads to a decrease in the Fe moment.…”

Section: Discussionmentioning

confidence: 99%

Focused-ion-beam induced interfacial intermixing of magnetic bilayers for nanoscale control of magnetic properties

Burn

Hase

Atkinson

2014

J. Phys.: Condens. Matter

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Modification of the magnetic properties in a thin-film ferromagnetic/non-magnetic bilayer system by low-dose focused ion-beam (FIB) induced intermixing is demonstrated. The highly localized capability of FIB may be used to locally control magnetic behaviour at the nanoscale. The magnetic, electronic and structural properties of NiFe/Au bilayers were investigated as a function of the interfacial structure that was actively modified using focused Ga + ion irradiation. Experimental work used MOKE, SQUID, XMCD as well as magnetoresistance measurements to determine the magnetic behavior and grazing incidence x-ray reflectivity to elucidate the interfacial structure. Interfacial intermixing, induced by low-dose irradiation, is shown to lead to complex changes in the magnetic behavior that are associated with monotonic structural evolution of the interface. This behavior may be explained by changes in the local atomic environment within the interface region resulting in a combination of processes including the loss of moment on Ni and Fe, an induced moment on Au and modifications to the spin-orbit coupling between Au and NiFe.

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“…A key method to obtain high perpendicular magneto-crystalline anisotropy (PMA) is to impose specific structural distortions, as, e.g., suggested for the case of high-magnetization FeCo alloys. 3 One particularly interesting material system is the body-centered tetragonal (bct) α ′ -Fe 8 N x 4 iron nitride phase, showing high magnetization as well as decent PMA, [5][6][7][8][9] with a uniaxial magneto-crystalline anisotropy constant, K u , as high as 1 · 10 7 erg/cm 3 for the ordered α ′′ -Fe 16 N 2 10 phase.…”

mentioning

confidence: 99%

Engineering perpendicular magnetic anisotropy in Fe via interstitial nitrogenation: N choose K

et al. 2016

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In this work, combining experimental results and first principles calculations, we show that interstitial nitrogen not only serves for inducing tetragonality in α′-Fe8Nx but is also essential for achieving a high degree of perpendicular magneto-crystalline anisotropy, K. Our results demonstrate that the orbital magnetic moments of the iron atoms above and below N in the direction of magnetization are much more susceptible to the applied magnetic field than their in-plane counterparts, leading to a giant value of K as compared to a hypothetical distorted material without N.

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Induced Magnetic Moment in Ferromagnetic Fe Alloys by Tetragonally Elongated Lattice Expansion

Cited by 52 publications

References 17 publications

Determination of the magnetostrictive atomic environments in FeCoB alloys

Determination of the magnetostrictive atomic environments in FeCoB alloys

Focused-ion-beam induced interfacial intermixing of magnetic bilayers for nanoscale control of magnetic properties

Engineering perpendicular magnetic anisotropy in Fe via interstitial nitrogenation: N choose K

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