Structure and magnetic properties of W-type hexaferrites

W-type hexaferrites (WHFs) (SrMe2Fe16O27, Me = Mg, Co, Ni and Zn) are hard magnetic materials with high potential for permanent magnet applications owing to their large crystalline anisotropy and high cation tunability. However, little is known with regards to their complex structural and magnetic c...
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Autor*in:	Mathias I. Mørch [verfasserIn] Jakob V. Ahlburg [verfasserIn] Matilde Saura-Múzquiz [verfasserIn] Anna Z. Eikeland [verfasserIn] Mogens Christensen [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2019

Schlagwörter:	hexaferrites magnetic structures combined neutron and X-ray refinement W-type hexaferrites

Übergeordnetes Werk:	In: IUCrJ - International Union of Crystallography, 2014, 6(2019), 3, Seite 492-499
Übergeordnetes Werk:	volume:6 ; year:2019 ; number:3 ; pages:492-499

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1107/S2052252519003130

Katalog-ID:	DOAJ017204089

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520			\|a W-type hexaferrites (WHFs) (SrMe2Fe16O27, Me = Mg, Co, Ni and Zn) are hard magnetic materials with high potential for permanent magnet applications owing to their large crystalline anisotropy and high cation tunability. However, little is known with regards to their complex structural and magnetic characteristics. Here, the substitution of metals (Me = Mg, Co, Ni and Zn) in WHFs is described and their crystal and magnetic structures investigated. From joined refinements of X-ray and neutron powder diffraction data, the atomic positions of the Me atoms were extracted along with the magnetic dipolar moment of the individual sites. The four types of WHFs exhibit ferrimagnetic ordering. For Mg, Ni and Zn the magnetic moments are found to be ordered colinearly and with the magnetic easy axis along the crystallographic c axis. In SrCo2Fe16O27, however, the spontaneous magnetization changes from uniaxial to planar, with the moments aligning in the crystallographic ab plane. Macromagnetic properties were measured using a vibration sample magnetometer. The measured saturation magnetization (Ms) between the different samples follows the same trend as the calculated Ms extracted from the refined magnetic moments of the neutron powder diffraction data. Given the correlation between the calculated Ms and the refined substitution degree of the different Me in specific crystallographic sites, the agreement between the measured and calculated Ms values consolidates the robustness of the structural and magnetic Rietveld model.
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callnumber-first	Q - Science
author	Mathias I. Mørch
spellingShingle	Mathias I. Mørch misc QD901-999 misc hexaferrites misc magnetic structures misc combined neutron and X-ray refinement misc W-type hexaferrites misc Crystallography Structure and magnetic properties of W-type hexaferrites
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topic_title	QD901-999 Structure and magnetic properties of W-type hexaferrites hexaferrites magnetic structures combined neutron and X-ray refinement W-type hexaferrites
topic	misc QD901-999 misc hexaferrites misc magnetic structures misc combined neutron and X-ray refinement misc W-type hexaferrites misc Crystallography
topic_unstemmed	misc QD901-999 misc hexaferrites misc magnetic structures misc combined neutron and X-ray refinement misc W-type hexaferrites misc Crystallography
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title	Structure and magnetic properties of W-type hexaferrites
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title_full	Structure and magnetic properties of W-type hexaferrites
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title_sort	structure and magnetic properties of w-type hexaferrites
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title_auth	Structure and magnetic properties of W-type hexaferrites
abstract	W-type hexaferrites (WHFs) (SrMe2Fe16O27, Me = Mg, Co, Ni and Zn) are hard magnetic materials with high potential for permanent magnet applications owing to their large crystalline anisotropy and high cation tunability. However, little is known with regards to their complex structural and magnetic characteristics. Here, the substitution of metals (Me = Mg, Co, Ni and Zn) in WHFs is described and their crystal and magnetic structures investigated. From joined refinements of X-ray and neutron powder diffraction data, the atomic positions of the Me atoms were extracted along with the magnetic dipolar moment of the individual sites. The four types of WHFs exhibit ferrimagnetic ordering. For Mg, Ni and Zn the magnetic moments are found to be ordered colinearly and with the magnetic easy axis along the crystallographic c axis. In SrCo2Fe16O27, however, the spontaneous magnetization changes from uniaxial to planar, with the moments aligning in the crystallographic ab plane. Macromagnetic properties were measured using a vibration sample magnetometer. The measured saturation magnetization (Ms) between the different samples follows the same trend as the calculated Ms extracted from the refined magnetic moments of the neutron powder diffraction data. Given the correlation between the calculated Ms and the refined substitution degree of the different Me in specific crystallographic sites, the agreement between the measured and calculated Ms values consolidates the robustness of the structural and magnetic Rietveld model.
abstractGer	W-type hexaferrites (WHFs) (SrMe2Fe16O27, Me = Mg, Co, Ni and Zn) are hard magnetic materials with high potential for permanent magnet applications owing to their large crystalline anisotropy and high cation tunability. However, little is known with regards to their complex structural and magnetic characteristics. Here, the substitution of metals (Me = Mg, Co, Ni and Zn) in WHFs is described and their crystal and magnetic structures investigated. From joined refinements of X-ray and neutron powder diffraction data, the atomic positions of the Me atoms were extracted along with the magnetic dipolar moment of the individual sites. The four types of WHFs exhibit ferrimagnetic ordering. For Mg, Ni and Zn the magnetic moments are found to be ordered colinearly and with the magnetic easy axis along the crystallographic c axis. In SrCo2Fe16O27, however, the spontaneous magnetization changes from uniaxial to planar, with the moments aligning in the crystallographic ab plane. Macromagnetic properties were measured using a vibration sample magnetometer. The measured saturation magnetization (Ms) between the different samples follows the same trend as the calculated Ms extracted from the refined magnetic moments of the neutron powder diffraction data. Given the correlation between the calculated Ms and the refined substitution degree of the different Me in specific crystallographic sites, the agreement between the measured and calculated Ms values consolidates the robustness of the structural and magnetic Rietveld model.
abstract_unstemmed	W-type hexaferrites (WHFs) (SrMe2Fe16O27, Me = Mg, Co, Ni and Zn) are hard magnetic materials with high potential for permanent magnet applications owing to their large crystalline anisotropy and high cation tunability. However, little is known with regards to their complex structural and magnetic characteristics. Here, the substitution of metals (Me = Mg, Co, Ni and Zn) in WHFs is described and their crystal and magnetic structures investigated. From joined refinements of X-ray and neutron powder diffraction data, the atomic positions of the Me atoms were extracted along with the magnetic dipolar moment of the individual sites. The four types of WHFs exhibit ferrimagnetic ordering. For Mg, Ni and Zn the magnetic moments are found to be ordered colinearly and with the magnetic easy axis along the crystallographic c axis. In SrCo2Fe16O27, however, the spontaneous magnetization changes from uniaxial to planar, with the moments aligning in the crystallographic ab plane. Macromagnetic properties were measured using a vibration sample magnetometer. The measured saturation magnetization (Ms) between the different samples follows the same trend as the calculated Ms extracted from the refined magnetic moments of the neutron powder diffraction data. Given the correlation between the calculated Ms and the refined substitution degree of the different Me in specific crystallographic sites, the agreement between the measured and calculated Ms values consolidates the robustness of the structural and magnetic Rietveld model.
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title_short	Structure and magnetic properties of W-type hexaferrites
url	https://doi.org/10.1107/S2052252519003130 https://doaj.org/article/e7cb63f9e91e4147af672535e58d0d4d http://scripts.iucr.org/cgi-bin/paper?S2052252519003130 https://doaj.org/toc/2052-2525
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author2	Jakob V. Ahlburg Matilde Saura-Múzquiz Anna Z. Eikeland Mogens Christensen
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Structure and magnetic properties of W-type hexaferrites

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