Relationship Between Magnetostriction and Magnetic Domain Structure in Fe-Based Alloy Single-Crystal Films With bcc(001) Orientation

Aida, Takuya; Kawai, Takeshi; Ohtake, Mitsuru; Futamoto, Masaaki; Inaba, Nobuyuki

doi:10.1109/tmag.2014.2320955

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…Such behavior can be related with the impossibility/difficulty of the magnetic moments reorientation and with the anisotropy of the magnetization resulting from the crystallographic restrictions for specific directions. 38 Additionally, it is observed that the ME response saturates at ∼1800 Oe, at the same magnetic field value where the magnetization derivative reaches its minimum (inset of Figure 6b). For higher fields, and contrary to what happens with the usual ME composites (constituted by piezoelectric and magnetostrictive materials), 4,23 the ME response does not decrease, maintaining its maximum value.…”

Section: ■ Introductionmentioning

confidence: 81%

Novel Anisotropic Magnetoelectric Effect on δ-FeO(OH)/P(VDF-TrFE) Multiferroic Composites

Martins

Larrea

Gonçalves

et al. 2015

ACS Appl. Mater. Interfaces

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The past decade has witnessed increased research effort on multiphase magnetoelectric (ME) composites. In this scope, this paper presents the application of novel materials for the development of anisotropic magnetoelectric sensors based on δ-FeO(OH)/P(VDF-TrFE) composites. The composite is able to precisely determine the amplitude and direction of the magnetic field. A new ME effect is reported in this study, as it emerges from the magnetic rotation of the δ-FeO(OH) nanosheets inside the piezoelectric P(VDF-TrFE) polymer matrix. δ-FeO(OH)/P(VDF-TrFE) composites with 1, 5, 10, and 20 δ-FeO(OH) filler weight percentage in three δ-FeO(OH) alignment states (random, transversal, and longitudinal) have been developed. Results have shown that the modulus of the piezoelectric response (10-24 pC·N(-1)) is stable at least up to three months, the shape and magnetization maximum value (3 emu·g(-1)) is dependent on δ-FeO(OH) content, and the obtained ME voltage coefficient, with a maximum of ∼0.4 mV·cm(-1)·Oe(-1), is dependent on the incident magnetic field direction and intensity. In this way, the produced materials are suitable for innovative anisotropic sensor and actuator applications.

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Section: ■ Introductionmentioning

confidence: 81%

Novel Anisotropic Magnetoelectric Effect on δ-FeO(OH)/P(VDF-TrFE) Multiferroic Composites

Martins

Larrea

Gonçalves

et al. 2015

ACS Appl. Mater. Interfaces

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“…As can be seen from Fig. 5(a-1 10 , both of which were larger than H r or one half of H r . Therefore, in the case of FMR measurements at higher frequencies (that is, in the Q-band) either non-anisotropic or less anisotropic ΔH values would be expected, since H r must be suf ciently large compared to the H a of the lms in order for the eld dragging effect to be negligible.…”

Section: Resultsmentioning

confidence: 76%

“…The details of the lm preparation procedures have been described in previous reports. 9,10) The structural analysis of the crystals was performed using RHEED and X-ray diffraction (XRD) with a Cu-K α radiation source. Magnetization curves were acquired using a vibrating sample magnetometer (VSM).…”

Section: Film Preparationmentioning

confidence: 99%

Anisotropic FMR Linewidths in Epitaxially Grown Si-Doped <i>A</i>2-Fe Thin Films

2016

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A series of 40 nm-thick Fe 100−x Si x (x = 0, 6 or 10 at%) single-crystal lms with an A2 phase were fabricated on MgO(001) substrates. Variations in the ferromagnetic resonant eld (H r ) and linewidth (ΔH) values with changes in the azimuthal angle (ϕ H ) were subsequently evaluated, using an electron cyclotron resonant system with X-band (9.86 GHz) microwaves at room temperature. The H r values exhibited fourfold symmetric behavior while varying the ϕ H . In addition, the ΔH values demonstrated symmetric behavior, with intense peaks in the vicinity of the magnetization hard-axis, and so the ΔH variation was reduced with increasing Si content. An analysis of the data was performed, employing the magnetization coherent rotation model. It was determined that the appearance of strong peaks can be attributed to differences between ϕ H and the magnetization angle (ϕ M ), based on the term [cos. This is believed to result from the insuf cient H r strength obtained during measurements with X-band microwaves relative to the anisotropy elds of the lms.

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“…The importance of the relationship between the magnetostriction and magnetic domain have also been discussed in studies on the other iron-based alloys. 82,83) Besides of the observation of magnetic domains, in order to understand the atomic structure of FeGa alloys, a few studies on the structure analysis. 8486) For example, the results showed that atomic short-range ordering is observed in FeGa alloys between 13 and 20.3 at%Ga for both slowcooled and quenched samples.…”

Section: Model Of Domain Structuresmentioning

confidence: 99%

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

et al. 2019

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This paper provides an overview of recent studies on the anisotropy of magnetostriction of functional iron-based alloys with the bodycentered cubic (bcc) structure; these are potential ferromagnetic materials for use in actuators and sensors at ambient temperature. The magnetostrictive properties of these functional iron-based alloys (such as FeGa, FeAl, and FeGe alloys) are known to strongly depend on the crystallographic orientation. In these functional iron-based alloys, non-Joulian magnetostriction, in which volume is not conserved, was observed; generally, the Joulian magnetostriction in a volume is not altered by magnetic fields. As the magnetostrictive properties of these ironbased alloys are correlated to their elastic properties through the magnetoelastic effect, their elastic properties have also been investigated using single crystals of iron-based alloys. In the present paper, we discuss the characteristic features of the anisotropy of magnetostriction and inverse magnetostriction, which occur when magnetic fields and external stresses, respectively, are applied. In order to clarify the microscopic processes underlying the magnetostriction and inverse magnetostriction, the alterations in the magnetic domains by magnetic fields and external stresses were observed. The results revealed that the magnetic domain structure in the functional iron-based alloys is altered in a complex manner when applied with external fields. For example, it was demonstrated that unique motions of different types of Bloch domain walls are observed with the application of magnetic fields or external stresses along specific directions of single crystals of FeGa alloys. The characteristic features of the motion of the domain walls are likely to correspond to the occurrence of magnetostriction and inverse magnetostriction, in which magnetic fluxes are induced during alternative vibration.

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Relationship Between Magnetostriction and Magnetic Domain Structure in Fe-Based Alloy Single-Crystal Films With bcc(001) Orientation

Cited by 7 publications

References 9 publications

Novel Anisotropic Magnetoelectric Effect on δ-FeO(OH)/P(VDF-TrFE) Multiferroic Composites

Novel Anisotropic Magnetoelectric Effect on δ-FeO(OH)/P(VDF-TrFE) Multiferroic Composites

Anisotropic FMR Linewidths in Epitaxially Grown Si-Doped <i>A</i>2-Fe Thin Films

Anisotropy of Magnetostriction of Functional BCC Iron-Based Alloys

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