New Determinations of the Saturation Magnetization of Nickel and Iron

Danan, H.; Herr, A.; Meyer, Andreas

doi:10.1063/1.2163571

Cited by 328 publications

(105 citation statements)

References 5 publications

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“…From the magnetization angle dependence of the resonance field, we obtained the magnetization amplitude value of m 0 M s ¼ 1.85±0.03 T, which is close to the literature value of 1.7 T for Fe 31 , and we found an in-plane uniaxial anisotropy of m 0 H U ¼ 0.101±0.001 T, which is typical for thin films of Fe grown on GaAs 32 . By solving the LandauLifshitz-Gilbert equation for a small current-induced excitation field, (h x , h y , h z )e jot , V d.c. is found to be comprised of symmetric and antisymmetric Lorentzian functions with coefficients V sym and V asy , respectively.…”

Section: Resultssupporting

confidence: 59%

Complementary spin-Hall and inverse spin-galvanic effect torques in a ferromagnet/semiconductor bilayer

et al. 2015

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Recently discovered relativistic spin torques induced by a lateral current at a ferromagnet/ paramagnet interface are a candidate spintronic technology for a new generation of electrically controlled magnetic memory devices. The focus of our work is to experimentally disentangle the perceived two model physical mechanisms of the relativistic spin torques, one driven by the spin-Hall effect and the other one by the inverse spin-galvanic effect. Here, we show a vector analysis of the torques in a prepared epitaxial transition-metal ferromagnet/ semiconductor-paramagnet single-crystal structure by means of the all-electrical ferromagnetic resonance technique. By choice of our structure in which the semiconductor paramagnet has a Dresselhaus crystal inversion asymmetry, the system is favourable for separating the torques due to the inverse spin-galvanic effect and spin-Hall effect mechanisms into the field-like and antidamping-like components, respectively. Since they contribute to distinct symmetry torque components, the two microscopic mechanisms do not compete but complement each other in our system.

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Section: Resultssupporting

confidence: 59%

Complementary spin-Hall and inverse spin-galvanic effect torques in a ferromagnet/semiconductor bilayer

et al. 2015

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“…For some examples, the saturation magnetization of bulk iron, cobalt, nickel, Fe 3 O 4 and CoFe 2 O 4 are 221.7, 162, 58.6, 92, and 80 emu g -1 , respectively. [60][61][62][63] These values serve as a rough basis to design materials with tailored magnetism.…”

Section: Wileyonlinelibrarycommentioning

confidence: 99%

3D Self‐Supporting Porous Magnetic Assemblies for Water Remediation and Beyond

Zhao

Zheng

et al. 2016

Advanced Energy Materials

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In the past few years, three‐dimensional self‐supporting porous magnetic assemblies (3D‐SPMAs) have emerged as a new research area in materials science because of their combined features of three‐dimensional self‐supporting porous assemblies (3D‐SPAs) and magnetic materials. Due to these attributes, 3D‐SPMAs gain numerous tempting properties such as magnetism‐induced actuating, magnetic shape memory effects, and alternative magnetic field (AMF) induced heat generation, showcasing huge potential in diverse applications stretching over water remediation, actuators, biomedical therapy, etc. Especially, 3D‐SPMAs displayed eminent potential in water remediation for their large processing capacity, remote controllability, and magnetic‐field‐mediated wettability. With the rising interest in 3D‐SPAs, the increasing understanding of magnetic materials, and the flourish of materials preparation technique, an upsurge has appeared in 3D‐SPMAs and thus managing them a class of emerging and promising functional materials. However, currently there are rarely review papers concerning 3D‐SPMAs. In this light, this review aims to express a comprehensive overview of this young field and fuel further innovations for preparation methods and practical applications of 3D‐SPMAs. The focus is placed on the synthetic strategies and applications especially in water remediation. The potential opportunities and challenges are also discussed.

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“…Two phases of bcc Fe with lattice constants (moments) of 2.87Å(2.22 µ B ) [25,26] and 2.83Å(2.21 µ B ), respectively, were investigated, yielding identical topologies. The total charge density topology is prototypical bcc, as can be seen in Fig.…”

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confidence: 99%

Topology of the Spin-Polarized Charge Density in bcc and fcc Iron

2008

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We investigate the topology of the spin-polarized charge density in bcc and fcc iron. While the total spin-density is found to possess the topology of the non-magnetic prototypical structures, in some cases the spin-polarized densities are characterized by unique topologies; for example, the spin-polarized charge densities of bcc and high-spin fcc iron are atypical of any known for nonmagnetic materials. In these cases, the two spin-densities are correlated: the spin-minority electrons have directional bond paths with deep minima in the minority density, while the spin-majority electrons fill these holes, reducing bond directionality. The presence of two distinct spin topologies suggests that a well-known magnetic phase transition in iron can be fruitfully reexamined in light of these topological changes. We show that the two phase changes seen in fcc iron (paramagnetic to low-spin and low-spin to high-spin) are different. The former follows the Landau symmetrybreaking paradigm and proceeds without a topological transformation, while the latter also involves a topological catastrophe. Bader's topological theory of molecular structure, Atoms in Molecules (AIM), has been successfully applied to a variety of crystalline systems [1][2][3][4][5][6][7][8][9][10][11]. It has been employed to investigate the nature of bonding in materials ranging from high temperature alloys to biological systems. These have yielded surprising results, such as second neighbor bond paths in B2 ionic crystals [3] and transition metal aluminides [4], with the magnitude of the latter correlating to failure properties [5]. Other studies have used bond path properties to offer first principles explanations of stress-induced failure in brittle and ductile alloys [7], as well as shear elastic constants in a variety of pure metals and alloys [8][9][10]. Building on these ideas and using the rigorous definitions of bond paths afforded by the theory, the anomalous behavior of iridium under shear was also explained [11].One of the attractive features of AIM is its reliance on the charge density, a quantum mechanical observable, that is most often calculated but can, in principle, be measured via X-ray diffraction techniques [12][13][14][15]. In a similar fashion, the spin-polarized charge density is an observable that can be calculated or measured using spinpolarized neutron diffraction. Despite the information and insights that have come from topological investigations of the total charge density, the same analysis has yet to be performed on spin-polarized densities. Here, we report the results from the first such studies, exploring the spin-minority and spin-majority topologies of bodycentered-cubic (bcc) and face-centered-cubic (fcc) iron.This first application of AIM to spin-density sheds light on the origins of the magnetic phase transitions of fcc iron. It is argued that this system undergoes two distinct phase transitions during volume expansion: a second- * Electronic address: trjones@mines.edu order phase change, from a paramagnetic to a l...

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New Determinations of the Saturation Magnetization of Nickel and Iron

Cited by 328 publications

References 5 publications

Complementary spin-Hall and inverse spin-galvanic effect torques in a ferromagnet/semiconductor bilayer

Complementary spin-Hall and inverse spin-galvanic effect torques in a ferromagnet/semiconductor bilayer

3D Self‐Supporting Porous Magnetic Assemblies for Water Remediation and Beyond

Topology of the Spin-Polarized Charge Density in bcc and fcc Iron

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