Spin reorientation transition and near room-temperature multiferroic properties in a W-type hexaferrite SrZn1.15Co0.85Fe16O27

Song, Ye; Fang, Yifei; Wang, L. Y.; Zhou, Weiping; Cao, Qingqi; Wang, D. H.; Du, Yingchao

doi:10.1063/1.4867370

Cited by 23 publications

(13 citation statements)

References 35 publications

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“…Furthermore, WHFs have also revealed themselves as promising materials for other applications, e.g. multiferroics (Song et al, 2014;Kimura, 2012) or microwave absorbance (Ahmad et al, 2012). As Sr-containing hexaferrites in general do not always display the same cation distribution as Ba-containing hexaferrites (Albanese et al, 1973;Sizov, 1968), it is highly relevant and interesting to investigate both the cation distribution and subsequent magnetic ordering of the Sr-containing hexaferrites.…”

Section: +mentioning

confidence: 99%

Structure and magnetic properties of W-type hexaferrites

Mørch

Ahlburg

Saura-Múzquiz

et al. 2019

IUCrJ

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W-type hexaferrites (WHFs) (SrMe 2Fe16O27, 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 (M s) between the different samples follows the same trend as the calculated M s extracted from the refined magnetic moments of the neutron powder diffraction data. Given the correlation between the calculated M s and the refined substitution degree of the different Me in specific crystallographic sites, the agreement between the measured and calculated M s values consolidates the robustness of the structural and magnetic Rietveld model.

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Section: +mentioning

confidence: 99%

Structure and magnetic properties of W-type hexaferrites

Mørch

Ahlburg

Saura-Múzquiz

et al. 2019

IUCrJ

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“…Furthermore, direct ME effects were also observed at fairly high temperatures in M-type hexaferrites 19 and even at room temperature in Co 2 Ztype hexaferrites 20 . Later on, direct ME effects were also found in the new U-and W-type hexaferrites 21,22 . Therefore, upon further control of the material properties of these electrically active hexaferrites, it is expected that large converse ME effects may potentially be achieved.…”

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confidence: 90%

Electrical control of large magnetization reversal in a helimagnet

et al. 2014

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Reversal of magnetization M by an electrical field E has been a long-sought phenomenon in materials science because of its potential for applications such as memory devices. However, the phenomenon has rarely been achieved and remains a considerable challenge. Here we report the large M reversal by E in a multiferroic Ba 0.5 Sr 1.5 Zn 2 (Fe 0.92 Al 0.08 ) 12 O 22 crystal without any external magnetic field. Upon sweeping E through the range of ±2 MVm À 1 , M varied quasi-linearly in the range of ±2 m B per f.u., resulting in the M reversal. Strong electrical modulation of M at zero magnetic field were observable up to B150 K. Nuclear magnetic resonance measurements provided microscopic evidence that the electric field and the magnetic field play equivalent roles in modulating the volume of magnetic domains. Our results suggest that the soft ferrimagnetism and the associated transverse conical state are key ingredients to achieve the large magnetization reversal at fairly high temperatures.

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“…For example, the SrZn2Fe16O27 composition (W-Zn2) is magnetically uniaxial and has the highest saturation magnetization of all hexagonal ferrites, whereas SrCo2Fe16O27 (W-Co2) is magnetically planar and has a high TC [11]. Depending on the specific x value in W-Co2-xZnx, the occurrence of a given magnetic state (a cone, a plane or an axis of easy magnetization) leads to spin reorientation transitions (SRT) between different anisotropy states when subjected to a magnetic field or to temperature variation [12,13]. Heat is evolved or absorbed during SRT transitions and this magnetocaloric effect suggests a potential application of W-type ferrites in room temperature magnetic refrigeration [14][15][16].…”

Section: Introductionmentioning

confidence: 99%