Magnetic anisotropy and crystalline orientation in high Hk FeCoB thin films

Hashimoto, A.; Matsuu, T.; Tada, Masaru; Nakagawa, Shigeki

doi:10.1063/1.2838225

Cited by 12 publications

(6 citation statements)

References 10 publications

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“…The above consideration showed that the oblique incidence at low gas pressure condition is a factor inducing lattice distortion along the easy axis direction, which causes the anisotropic residual stress originating the magnetic anisotropy energy via inverse magnetostrictive effect in the Ru/FeCoB film. 6 Figure 3 shows the change in H k as a function of Ru Figure 4 shows the XRD diagrams of 100-nm-thick Ru films prepared at 1, 3, 6, and 16 mTorr of Ar gas pressures. The Ru film prepared at a high gas pressure of 16 mTorr indicated low crystallinity and disappearance of the ͑001͒ plane orientation, most of which is closely packed plane.…”

Section: Resultsmentioning

confidence: 99%

Ru/FeCoB double layered film with high in-plane magnetic anisotropy field of 500 Oe

Hirata

Hashimoto

Matsuu

et al. 2009

Journal of Applied Physics

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An algorithm to extract effective magnetic parameters of thin film with in-plane uniaxial magnetic anisotropy J. Appl. Phys. 107, 09C507 (2010); 10.1063/1.3357325 Direct observation of an anisotropic in-plane residual stress induced by B addition as an origin of high magnetic anisotropy field of Ru/FeCoB film J. Appl. Phys. 107, 09A323 (2010); 10.1063/1.3350899Ru/FeCoB crystalline soft magnetic underlayers with high anisotropy field for CoPtCr -SiO 2 granular perpendicular magnetic recording media FeCoB layers prepared on Ru underlayer possess a high saturation magnetization M s and a high in-plane magnetic anisotropy filed H k . Effects of preparation conditions were investigated. Low Ar gas pressure condition and thicker film thickness were effective to attain distortion of FeCo crystallite. As the crystallinity of Ru underlayer became higher, higher H k was induced. The accumulation of anisotropic stress in the film caused by the oblique incidences of depositing atoms with high energy seems to be one of the important effects to attain high anisotropy field. It was succeeded to prepare the Ru/FeCoB film with high H k of 500 Oe.

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Section: Resultsmentioning

confidence: 99%

Ru/FeCoB double layered film with high in-plane magnetic anisotropy field of 500 Oe

Hirata

Hashimoto

Matsuu

et al. 2009

Journal of Applied Physics

Self Cite

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“…The magneto-elasticity of cubic ferromagnetic materials is described using a Gibbs free energy density Ψ = Ψ(𝐼 𝑘 ) defined as a function of well-chosen cubic invariants 𝐼 𝑘 of the stress 𝜎 𝜎 𝜎 and the magnetization 𝑀 𝑀 𝑀 . It is relevant to take these cubic invariants into account for every crystallographic texture/fiber, with the drawback that the corresponding minimal integrity basis is constituted of a quite large number (30) of invariants [51,54].…”

Section: Discussionmentioning

confidence: 99%

“…This is frequently observed for very thin magnetic materials used in high frequency electronic systems (the small thickness allows for a better homogeneity of the electromagnetic fields through the thickness at very high frequency, typically GHz). The textures encountered may vary but generally follow epitaxy rules (depending on the sublayer orientation): the direction normal to the layer is frequently a direction of strong crystalline symmetry [9,60,30].…”

Section: Introductionmentioning

confidence: 99%

Reduced polynomial invariant integrity basis for in-plane magneto-mechanical loading

Taurines¹,

Kolev²,

Desmorat³

et al. 2022

Preprint

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The description of the behavior of a material subjected to multi-physics loadings requires the formulation of constitutive laws that usually derive from Gibbs free energies, using invariant quantities depending on the considered physics and material symmetries. On the other hand, most of crystalline materials can be described by their crystalline texture and the associated preferred directions of strong crystalline symmetry (the so-called fibers). Moreover, among the materials produced industrially, many are manufactured in the form of sheets or of thin layers. This article has for object the study of the magneto-mechanical coupling which is a function of the stress 𝜎 𝜎 𝜎 and the magnetization 𝑀 𝑀 𝑀 . We consider a material with cubic symmetry whose texture can be described by one of three fibers denoted as 𝜃, 𝛾 or 𝛼 ′ , and which is thin enough so that both the stress and the magnetization can be considered as in-plane quantities. We propose an algorithm able to derive linear relations between the 30 cubic invariants 𝐼 𝑘 of a minimal integrity basis describing a magneto-elastic problem, when they are restricted to in-plane loading conditions and for different fiber orientations. The algorithm/program output is a reduced list of invariants of cardinal 7 for the {100}-oriented 𝜃 fiber, of cardinal 15 for the {110}-oriented 𝛼 ′ fiber and of cardinal 8 for the {111}-oriented 𝛾 fiber. This reduction (compared to initial cardinal 30) can be of great help for the formulation of low-parameter macroscopic magneto-mechanical models.

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“…In ferromagnetic metal films, nanocrystallization with doping nonmagnetic elements, such as CoM (M = Zr, Hf, TaN), [104][105][106] FeM (M = B, Hf, Zr), [107][108][109][110] FeCoM (M = B, Hf, Zr), [111][112][113] are effective approaches to obtain IPUMA, which utilizes the dipole interaction between two phases with different magnetizations. [114,115] In addition, the magnetic anisotropy of a granular system with doping nonmagnetic oxide materials, such as SiO 2 , [116] TiO 2 , [117] Al 2 O 3 , [118] is controlled by changing the effective magnetocrystalline anisotropy of the magnetic nanoparticles.…”

Section: Intra-layer Modulationmentioning

confidence: 99%

High frequency magnetic properties of ferromagnetic thin films and magnetization dynamics of coherent precession

2015

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We focus on the ferromagnetic thin films and review progress in understanding the magnetization dynamic of coherent precession, its application in seeking better high frequency magnetic properties for magnetic materials at GHz frequency, as well as new approaches to these materials’ characterization. High frequency magnetic properties of magnetic materials determined by the magnetization dynamics of coherent precession are described by the Landau–Lifshitz–Gilbert equation. However, the complexity of the equation results in a lack of analytically universal information between the high frequency magnetic properties and the magnetization dynamics of coherent precession. Consequently, searching for magnetic materials with higher permeability at higher working frequency is still done case by case.

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Magnetic anisotropy and crystalline orientation in high Hk FeCoB thin films

Cited by 12 publications

References 10 publications

Ru/FeCoB double layered film with high in-plane magnetic anisotropy field of 500 Oe

Ru/FeCoB double layered film with high in-plane magnetic anisotropy field of 500 Oe

Reduced polynomial invariant integrity basis for in-plane magneto-mechanical loading

High frequency magnetic properties of ferromagnetic thin films and magnetization dynamics of coherent precession

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