The remagnetization process in thin and ultra-thin Fe-rich amorphous wires

Zhukov, А.; Vázquez, M.; Velázquez, Juan J. L.; Chiriac, H.; Larin, V.

doi:10.1016/0304-8853(95)00393-2

Cited by 133 publications

(86 citation statements)

References 7 publications

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“…This damping is related to the Gilbert damping parameter, α and is inversely proportional to the domain wall width δw, β r ≈αM s /γδ w ≈M s (K me /A) 1/2 (7) where γ is the gyromagnetic ratio, A is the exchange stiffness constant, K me is the magnetoelastic anisotropy energy given by (5).…”

Section: V=s(h-h 0 )mentioning

confidence: 99%

“…It is worth mentioning, that generally much faster DW propagation at relatively low magnetic field has been reported for cylindrical thicker amorphous micrometric wires [2][3][4][5][6]. The micromagnetic origin of head-to head DW in microwires is still unclear, although it is clear that this DW is relatively thick and has complex structure [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Single Large Barkhausen Jump, observed in different families of amorphous wires has been interpreted as the magnetization reversal in a large single domain [2][3][4][5]. The rectangular hysteresis loop has been interpreted in terms of nucleation or depinning of the reversed domains inside the internal single domain and the consequent domain wall propagation [2][3][4][5][6]. Consequently, perfectly rectangular shape of the hysteresis loop has been related with a very high velocity of such domain wall propagation.…”

Section: Introductionmentioning

confidence: 99%

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Domain wall dynamics of magnetically bistable microwires

Zhukova

Blanco

Ipatov

et al. 2012

EPJ Web of Conferences

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Abstract. We studied domain wall propagation of magnetically-bistable Fe-Co-rich microwires paying attention on effect of applied and internal stresses. We measured hysteresis loops and domain wall propagation in various magnetic Fe-Co-rich amorphous microwires with metallic nucleus diameters (from 12 m till 22 m) using Sixtus Tonks-like experiments. Application of tensile stresses results in decreasing of domain wall velocity. We discussed magnetoelastic contribution in dynamics of domain wall propagation. We observed, that microwires with different geometries exhibit v(H) dependences with different slopes. Application of stresses resulted in decrease of DW velocity, v, and DW mobility S. Quite fast DW propagation (v till 2500 m/s at H about 30 A/m) has been observed in low magnetostrictive magnetically bistable Co 56 Fe 8 Ni 10 Si 110 B 16 microwires. Consequently, we can assume that generally magnetoelastic energy affects DW dynamics: decreasing magnetoelastic energy, K me , DW velocity increases.

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Section: V=s(h-h 0 )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Domain wall dynamics of magnetically bistable microwires

Zhukova

Blanco

Ipatov

et al. 2012

EPJ Web of Conferences

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“…25 In the amorphous state, a quite simple domain structure, determined by magnetostrictive and shape energy terms, is responsible for this behavior. It consists of a singledomain 26 inner core with magnetization oriented parallel to the wire axis and surrounded by an outer domain shell with the magnetization oriented perpendicular to the wire axis with closure domains at the end of the microwire. This configuration results in the specific magnetization process when the wire is magnetized in a field parallel to its axis.…”

mentioning

confidence: 99%

Low temperature magnetic behaviour of glass-covered magnetic microwires with gradient nanocrystalline microstructure

Serrano

Hernando

Marı́n

2014

Journal of Applied Physics

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Slow nanocrystallization driving dynamics can be affected by the combination of two factors: sample residual stresses and sample geometry. This effect is evidenced at the initial stages of nanocrystallization of amorphous CoFeSiBCuNb magnetic microwires. Transmission electron microscopy observations indicate how crystallization at temperatures between 730 and 780 K results in a graded microstructure where the crystallization at the surface skin of the microwire, which remains almost amorphous, differs from that of the middle, where elongated grains are observed, and inner regions. However, samples annealed at higher temperatures present a homogeneous microstructure. The effect of gradient microstructure on magnetic properties has been also analyzed and a loss of bistable magnetic behaviour at low temperatures, from that obtained in the amorphous and fully nanocrystallized sample, has been observed and ascribed to changes in sign of magnetostriction for measuring temperatures below 100 K. V C 2014 AIP Publishing LLC.[http://dx.doi.org/10.1063/1.4862540] High performance materials are those essential to important modern applications as ultra-sensitive sensors, actuators and transducers, space power generators, high density magnetic storage media, electromagnetic waves shielding, etc., that should work in extreme environments. However, the full advantage that these materials can provide is strongly dependent on composition and microstructure.1 On the other hand, the concept of gradient materials that refer to the introduction of engineered chemical composition and/or microstructure parameter profiles has been used to tailor materials with desired properties and has gained much attention due to their potential applications. [2][3][4][5] In the case of magnetic materials, high-performance means operating at high frequency, high power densities, and high temperatures in extreme environments.6-8 These applications require soft magnetic materials not only preserving excellent conductivity, high permeability and saturation magnetization, low coercivity, low eddy-current losses, and high Curie temperatures 6-9 but also the necessary mechanical strength (i.e., toughness) for processing.Nanocrystallization from the amorphous state has become a promising method currently available for producing desirable amorphous-nanocrystalline structures with high magnetic characteristics but, generally, these processes involve mechanical properties deterioration associated to embrittlement and ultimate rupture strength decrease. 10Consequently, new graded processes, focused to obtain high-performance nanocrystalline magnetic materials with superior mechanical properties combined with excellent magnetic and/or electronic properties, are going on. [6][7][8] These graded mechanisms should be based on the fact that amorphous solids are thermodynamically metastable and amorphous to-crystalline phase transformation will be stimulated if sufficient energy to drive this process is supplied. Thermal annealing is a common method to ahead these tra...

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“…First studies on the magnetization profile in amorphous wires were performed years ago from experimental and micromagnetic viewpoints. [6][7][8][9][10] Measurements were typically performed by fluxmetric induction technique using small secondary coils detecting local magnetization with precision of 1-2 mm as determined by the pickup width.…”

mentioning

confidence: 99%

Local magnetization profile and geometry magnetization effects in microwires as determined by magneto-optical Kerr effect

Real

Infante

et al. 2013

Journal of Applied Physics

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The local magnetization profile along the length in magnetostrictive Fe-based magnetic microwires has been determined by magneto-optical Kerr effect. The study has been performed in microwires with different geometrical dimensions (i.e., diameter and length). The profiles of remanent magnetization and coercivity remain constant at the middle part for all microwires, whereas significant reduction of net magnetization accompanied by significant change of coercivity is observed when approaching their ends. This local region extends just few tens of micrometer for thin (around 1 μm diameter) wires and up to several hundreds of micrometer for thick (around 10 μm diameter) wires. That predicts that critical length to observe bistability goes from 50 μm to nearly 1 mm as diameter increases from 1 to 10 μm. Results are further interpreted considering the local distribution of magnetic charges at the ends which, arising to reduce stray fields, lead in some cases to inverted loops.

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The remagnetization process in thin and ultra-thin Fe-rich amorphous wires

Cited by 133 publications

References 7 publications

Domain wall dynamics of magnetically bistable microwires

Domain wall dynamics of magnetically bistable microwires

Low temperature magnetic behaviour of glass-covered magnetic microwires with gradient nanocrystalline microstructure

Local magnetization profile and geometry magnetization effects in microwires as determined by magneto-optical Kerr effect

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