XVII. <i>On the effects of magnetism upon the dimensions of iron and steel bars</i>

Joule, James Prescott

doi:10.1080/14786444708645656

Cited by 108 publications

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“…Although we emphasize the importance of nanostructure, additional insight can be gained by examining the analytical theories. Specifically, the low field magnetic susceptibility for a ferromagnet containing random uniaxial anisotropies was evaluated to be χ CSG = 1/2β r (15/(4H r /H ex )) 3 , where β r ∝ D r , H ex ∝ AM SAT /R a , H r = β r M SAT , D r is a randomized D, and R a is the spatial scale over which anisotropy changes.…”

Section: Other Considerationsmentioning

confidence: 99%

“…2 Here, we approach from the different vantage point of probing inherent properties of CPs that are expressed in functional systems. Specifically, pressure dependent magnetism is an attractive property for transducers, and while it has been studied in metals and metallic alloys for centuries, 3 the more elaborately structured CPs are only recently being investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Increasing the strength of the random anisotropy to a maximum value of 5 × 10 4 J/m 3 (SurfHardRand5) has a more profound effect as the anisotropy and superexchange energies become comparable; the coercive field is also increased ten times and saturation is pushed to higher fields. However, SurfHardRand5 is more like a mosaic of weakly interacting uniaxial nanoparticles that undergo coherent rotation, as the micromagnetic cell size is 1000 nm 3 . After a vortex is annihilated, the spins must still continue to undergo rotation until saturation is reached, Fig.…”

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confidence: 99%

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High-pressure neutron scattering of the magnetoelastic Ni-Cr Prussian blue analog

et al. 2015

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This paper summarizes 0 GPa to 0.6 GPa neutron diffraction measurements of a nickel hexacyanochromate coordination polymer (NiCrPB) that has the face-centered cubic, Prussian blue structure. Deuterated powders of NiCrPB contain ≈100 nm sided cubic particles. The application of a large magnetic field shows the ambient pressure, saturated magnetic structure. Pressures of less than 1 GPa have previously been shown to decrease the magnetic susceptibility by as much as half, and we find modifications to the nuclear crystal structure at these pressures that we quantify. Bridging cyanide molecules isomerize their coordination direction under pressure to change the local ligand field and introduce inhomogeneities in the local (magnetic) anisotropy that act as pinning sites for magnetic domains, thereby reducing the low field magnetic susceptibility.

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Section: Other Considerationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-pressure neutron scattering of the magnetoelastic Ni-Cr Prussian blue analog

et al. 2015

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“…In the low-signal limit less than one-third the maximum strain capability [3], the magnetic circuit (including the MC) works linearly and does not reach saturation, the approach to magnetostriction may rely on the electromagnetic and structural constitutive laws (in axial direction) (1) where Because the cylindrical MC has to fit into the experimental apparatus, some overall bounds for the axial and radial dimensions have to be imposed. The radius and height of the MC may not exceed the sizes of the working space -these are the upper limits.…”

Section: Magnetostriction -The Constitutive Lawsmentioning

confidence: 99%

“…Magnetostriction is a property of ferromagnetic materials that deform, either expand (positive effect) or contract (negative effect), when subjected to a longitudinal, external magnetic field, in the direction of the field [1]. Microscopically, this unidirectional distortion may be due to the spin-orbit mutual potential energy, a function of the distances between atoms and the direction of magnetization [2,3].…”

Section: Introductionmentioning

confidence: 99%

Shape and structure optimization of a magnetostrictive cored actuator

Morega¹,

Popac²,

Morega³

et al. 2016

IJHT

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Shape and structure are key factors in the optimal sizing of engineered products, and the constructal theory provides the conceptual framework for achieving this design objective. This paper is concerned with the constructal optimization of a small size linear motor (actuator) that is using a cylindrical Terfenol-D magnetostrictive core (TD-MC). The system under optimization is the TD-MC, subjected to magnetic field and the mechanical stress produced by the inverse Villari effect. The two phenomena are coupled, which makes the optimization problem more difficult. The TD-MC (material) structure is a design input data, therefore the only degree of freedom in morphing the active core is its shape. We present a mathematical model that describes the electromagnetic field -structure interactions that is used for numerical simulations aimed at identifying the optimal shape for the active MC. Both no-load and load steady state working conditions are considered for several MC cores sizes with different aspect ratios. The MC premagnetization is provided altogether with the actuation by the electrical current in the motor winding. Intensive numerical work shows off optimal shapes for the MC for a specific structural actuator design.

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Non‐linear magnetoelastic coupling in monolayers: Experimental challenges and theoretical insights

Sander

Kirschner

2011

Physica Status Solidi (b)

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Recent results of experimental studies on magnetoelastic coupling in epitaxial monolayers are compiled and discussed in view of theoretical work. The observation of non-bulk like magnetoelastic coupling in strained systems in experiment and theory is ascribed to an effective and strain-dependent magnetoelastic coupling. It is described as a second-order strain contribution to the energy density. We comment on the importance of inhomogeneous strain and of its relaxation for the magnetic anisotropy of nanostructures.

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XVII. On the effects of magnetism upon the dimensions of iron and steel bars

Cited by 108 publications

References 0 publications

High-pressure neutron scattering of the magnetoelastic Ni-Cr Prussian blue analog

High-pressure neutron scattering of the magnetoelastic Ni-Cr Prussian blue analog

Shape and structure optimization of a magnetostrictive cored actuator

Non‐linear magnetoelastic coupling in monolayers: Experimental challenges and theoretical insights

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