Magnetomechanical Ratios for Fe-Co Alloys

Scott, G. G.; Sturner, H. W.

doi:10.1103/physrev.184.490

Cited by 40 publications

(11 citation statements)

References 11 publications

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“…In transition metals, the orbital momentum is quenched by the electron itinerancy, but it is partly restored by the spin-orbit coupling. Therefore, the spin-orbit coupling of Ta, which is 4 times larger 28 than that of Fe, is expected to increase g to levels unaccessible in CoFe alloys, 29 in qualitative agreement with our data.…”

Section: Resultssupporting

confidence: 89%

Irradiation-induced tailoring of the magnetism of CoFeB/MgO ultrathin films

Devolder

Barisic

Eimer

et al. 2013

Journal of Applied Physics

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We study perpendicularly magnetized Ta/CoFeB/MgO films and investigate whether their irradiation with light ions can improve their properties by inducing a different crystallization dynamics. We report the magnetization, anisotropy, g-factor, and damping dependence upon irradiation fluence and discuss their evolutions with collisional mixing simulations and its expected consequence on magnetic properties. We show that after a short irradiation at 100 °C, the anisotropy increases close to the value obtained by conventional high temperature annealing. Higher irradiation-induced increase of anisotropy can be obtained but with a detrimental effect on the damping that can be understood from spin-orbit contributions.

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Section: Resultssupporting

confidence: 89%

Irradiation-induced tailoring of the magnetism of CoFeB/MgO ultrathin films

Devolder

Barisic

Eimer

et al. 2013

Journal of Applied Physics

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“…The polarized spins are confined to small, needle-shaped regions of Fe-Co alloy that precipitate out during heat treatment. Although we are not aware of direct measurements of the spin and orbital moments of Alnico 5, we can infer the spin fraction from "Einstein-De Haas" measurements [34] of the magneto-mechanical factors, g ′ , of magnetically "softer" Fe-Co alloys. The g ′ measurements determine, f , the fractional spin contribution to the magnetic moment via Although the magnetization of cobalt in Sm Co 5 , as that of Alnico, arises primarily from polarized 3d electrons, the orbital moments are not as fully quenched because the rare earth atom alters the crystal lattice structure.…”

Section: Discussionmentioning

confidence: 99%

Preferred-frame andCP-violation tests with polarized electrons

et al. 2008

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We used a torsion pendulum containing ≈ 10 23 polarized electrons to search new interactions that couple to electron spin. We limit CP-violating interactions between the pendulum's electrons and unpolarized matter in the earth or the sun, test for rotation and boost-dependent preferred-frame effects using the earth's rotation and velocity with respect to the entire cosmos, and search for exotic velocity-dependent potentials between polarized electrons and unpolarized matter in the sun and moon. We find CP -violating parameters |g e P g N S |/(hc) < 9.4 × 10 −37 and |g efor λ > 1AU. We test for preferred-frame interactions of the form V = −σ e ·A, V = −Bσ e ·v/c, on A in terms of non-commutative geometry, we obtain an upper bound of (355 l GUT ) 2 on the minimum observable area, where l GUT =hc/(10 16 GeV) is the grand unification length. We find that |B| ≤ 1.2 × 10 −19 eV. All 9 components of C are constrained at the 10 −17 to 10 −18 eV level.We determine 9 linear combinations of parameters of the Standard Model Extension; rotationalnoninvariant and boost-noninvariant terms are limited at roughly the 10 −31 GeV and 10 −27 GeV levels, respectively. Finally, we find that the gravitational mass of an electron spinning toward the galactic center differs by less than about 1 part in 10 21 from an electron spinning in the opposite direction. As a byproduct of this work, the density of polarized electrons in Sm Co 5 was measured to be (4.19 ± 0.19) × 10 22 cm −3 at a field of 9.6 kG.

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“…Fig. 6. Beam polarization determined from data using di erent target foils plotted versus the foil number as de ned in Table 1.…”

Section: Polarization Results and Study Of Systematic E Ectsmentioning

confidence: 99%

A Møller polarimeter for high energy electron beams

Band

Mitchell

Prepost

et al. 1997

Nuclear Instruments and Methods in Physics Research Section A:

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A single arm M ller polarimeter used to measure the longitudinal beam polarization of the 48 GeV electron beam for SLAC xed target experiment E 154 is described. The polarimeter utilizes an array of silicon strip detectors and a dipole magnetic spectrometer to detect M ller scattered electrons from magnetized Fe-Co alloy target foils. The details of the foil polarization measurements and analysis technique are discussed. The high statistical precision of the M ller data and the stablity of the SLAC polarized source made precise studies of the systematic errors in the analysis possible. An overall systematic error of 2.7 is assigned to the beam polarization determination. Abstract A single arm M ller polarimeter used to measure the longitudinal beam polarization of the 48 GeV electron beam for SLAC xed target experiment E 154 is described. The polarimeter utilizes an array of silicon strip detectors and a dipole magnetic spectrometer to detect M ller scattered electrons from magnetized Fe-Co alloy target foils. The details of the foil polarization measurements and analysis technique are discussed. The high statistical precision of the M ller data and the stablity of the SLAC polarized source made precise studies of the systematic errors in the analysis possible. An overall systematic error of 2.7 is assigned to the beam polarization determination. Submitted to Nuclear Instruments and Methods in Physics Research

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Magnetomechanical Ratios for Fe-Co Alloys

Cited by 40 publications

References 11 publications

Irradiation-induced tailoring of the magnetism of CoFeB/MgO ultrathin films

Irradiation-induced tailoring of the magnetism of CoFeB/MgO ultrathin films

Preferred-frame andCP-violation tests with polarized electrons

A Møller polarimeter for high energy electron beams

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