In situ observations of domain wall motion in Mn–Zn and Ni–Zn ferrites by Lorentz microscopy and electron holography

Kasahara, Takashi; Park, Hyun Soon; Shindo, Daisuke; Yoshikawa, H.; Sato, Takafumi; Kondo, Koichi

doi:10.1016/j.jmmm.2005.12.007

Cited by 16 publications

(4 citation statements)

References 9 publications

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“…Nowadays, Lorentz transmission electron microscopy has been utilized to visually characterize the magnetic domain structure of ferrite 22–27 . The distribution of domain walls can be shown by comparing the images in under‐focused mode and over‐focused mode.…”

Section: Introductionmentioning

confidence: 99%

“…Nowadays, Lorentz transmission electron microscopy has been utilized to visually characterize the magnetic domain structure of ferrite. [22][23][24][25][26][27] The distribution of domain walls can be shown by comparing the images in under-focused mode and over-focused mode. However, these static characterization results are difficult to directly establish a relationship with the dynamic core losses and a medium that can reflect the dynamic magnetization process, that is, the magnetic spectrum, is also needed.…”

Section: Introductionmentioning

confidence: 99%

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Effects of magnetic domain morphology on the magnetic spectrum and high‐frequency core losses of MnZn ferrites

Wu,

Yu,

Guo

et al. 2023

J Am Ceram Soc.

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MnZn ferrites that exhibit low core losses at high frequencies are suitable for the integration and miniaturization of power conversion devices. To obtain low core losses at high frequencies, it is important to understand the underlying mechanism. In this work, MnZn ferrites with various grain sizes were produced by changing the sintering temperature. The relationship between domain morphology, dynamic magnetization behavior, and core losses at high frequencies was carefully investigated. As the average grain size approached the critical size of single‐domain state, the contribution of domain wall displacement to complex permeability decreased, while domain wall resonant frequency improved significantly, resulting in the suppression of residual loss at 3 MHz. As the average grain size increased, the domain morphology changed from a single‐domain state to a multidomain state, which increased the initial permeability and decreased hysteresis loss. However, the number of domain walls increased, causing a significant decrease in the domain wall resonant frequency, and resulting in a sharp increase in residual loss. These results provide valuable insights into reducing high‐frequency core losses in MnZn ferrites by domain engineering.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of magnetic domain morphology on the magnetic spectrum and high‐frequency core losses of MnZn ferrites

Wu,

Yu,

Guo

et al. 2023

J Am Ceram Soc.

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“…Such techniques allow probing materials properties to gain fundamental understanding as well as to study in-service behavior to develop materials technology. Over the past several decades, in situ sample holder capabilities have been developed primarily for heating [1], cryogenic [2], straining [3] and magnetizing [4] (Lorentz microscopy) studies. Another notable development in this domain is environmental TEM which allows studying chemical reactions in situ by controlling the gas pressure in the sample chamber [5].…”

Section: Introductionmentioning

confidence: 99%

In situ break-junction sample holder for transmission electron microscopy

Eswara

Goff

Viret

et al. 2013

Eur. Phys. J. Appl. Phys.

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Abstract. In this article, we report on the design and construction of an in situ break-junction sample holder for transmission electron microscopy. The holder is based on the differential-screw mechanism. The technical details and a comprehensive consideration to all relevant critical issues surrounding the instrumentation procedure are presented. An application of the newly developed instrument is demonstrated using the example of a micro-scale gold wire. We also provide a detailed discussion on the challenges involved and the pitfalls to avoid in developing similar in situ holders.

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“…The cationic distributions of Cu 1Àx Ni x FeMnO 4 ferrites determined by Mo¨ssbauer spectroscopy revealed a partially inverse spinel structure [4]. In situ observations by Lorentz microscopy with an applied magnetic field revealed that, in Ni-Zn ferrites [5], the domain walls move along the grain boundary but are pinned at the grain boundary and pores. X-ray photoelectron spectroscopy was employed to find the cationic distributions of Mg 1Àx Ni x Fe 2 O 4 ferrites [6].…”

Section: Introductionmentioning

confidence: 99%

Microstructure characterization and magnetic behavior of NiAlxFe2−xO4 and Ni1−yMnyAl0.2Fe1.8O4 ferrites

Al-Haj

2007

Journal of Magnetism and Magnetic Materials

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In situ observations of domain wall motion in Mn–Zn and Ni–Zn ferrites by Lorentz microscopy and electron holography

Cited by 16 publications

References 9 publications

Effects of magnetic domain morphology on the magnetic spectrum and high‐frequency core losses of MnZn ferrites

Effects of magnetic domain morphology on the magnetic spectrum and high‐frequency core losses of MnZn ferrites

In situ break-junction sample holder for transmission electron microscopy

Microstructure characterization and magnetic behavior of NiAlxFe2−xO4 and Ni1−yMnyAl0.2Fe1.8O4 ferrites

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