Influence of heat treatment on structure and reversal magnetization processes of Sm12.5Co66.5Fe8Cu13 alloy

Dośpiał, M.; Nabiałek, M.; Szota, M.; Mydlarz, T.; Ozga, K.; Lesz, S.

doi:10.1016/j.jallcom.2011.11.096

Cited by 13 publications

(13 citation statements)

References 17 publications

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“…Next, range (II) in literature is attributed to magnetization changes resulting from the motion of domain walls after their unpinning in multidomain grains or bowing of strongly pinned domain walls [1315]. Finally, the range (III) represents irreversible magnetization changes resulting from unpinning of domain walls [4,16].…”

Section: Resultsmentioning

confidence: 99%

“…Basing on reversible component it has been found that for the initial values of applied eld, the magnetization changes are mainly resulting from the rotation of magnetization vector. In turn, the reversible changes occurring for the values of external magnetic eld close to the coercivity of the sample are attributed to bowing of strongly pinned domain walls or in motion of unpinned domain walls [2,4,16].…”

Section: Discussionmentioning

confidence: 99%

“…The irreversible magnetization changes are resulting from pinning of domain walls on structural defects and grain boundaries [3,4,16].…”

Section: Discussionmentioning

confidence: 99%

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Modeling the Hysteresis Loop of the Nanocomposite Material Using Modified Hyperbolic T(x) Model

Dośpiał

2015

Acta Phys. Pol. A

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Modeling the Hysteresis Loop of the Nanocomposite Material Using Modified Hyperbolic T(x) Model

Dośpiał

2015

Acta Phys. Pol. A

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“…4,5 Another point is that the coercivity is controlled by the nucleation of reversed domain in some 2:17 type SmCo magnets with abnormal coercivity. 3,6,7 Some studies [8][9][10][11] also thought that the inter-grain exchange coupling is a significant factor to influence the coercivity of Sm(Co, Fe, Cu, Zr) z magnets. Nevertheless, all points insist that the cellular structure is responsible for the coercivity of Sm(Co, Fe, Cu, Zr) z magnets.…”

Section: Introductionmentioning

confidence: 99%

Magnetization reversal process in (Sm, Dy, Gd) (Co, Fe, Cu, Zr)z magnets with different cellular structures

Liu

Zhang

et al. 2017

AIP Advances

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The high squareness Sm-Co magnet having H cb =10.6 kOe at 150°C AIP Advances 7, 056223 (2017) Magnetization reversal mechanism is found to vary with cellular structures by a comparative study of the magnetization processes of three (Sm, Dy, Gd) (Co, Fe, Cu, Zr) z magnets with different cellular structures. Analysis of domain walls, initial magnetization curves and recoil loops indicates that the morphology of cellular structure has a significant effect on the magnetization process, besides the obvious connection to the difference of domain energy density between cell boundary phase (CBP) and main phase. The magnetization of Sample 2 (with a moderate cell size and uniformly continuous CBPs) behaves as a strong coherence domain-wall pinning effect to the domain wall and lead to a highest coercivity in the magnet. The magnetization of Sample 1 (with thin and discontinuous CBPs) shows an inconsistent pinning effect to the domain wall while that of Sample 3 (with thick and aggregate CBPs) exhibits a two-phase separation magnetization. Both the two cases lead to lower coercivities. A simplified model is given as well to describe the relationships among cellular structure and magnetization behavior. © 2017 Author (s)

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“…4,5 The annealing process applied to these materials leads to the decomposition of the SmCo 7 phase into more stable structures, composed of the SmCo 5 and Sm 2 Co 17 phases. [6][7][8] One of the most popular methods for determining the reversal-magnetization process is an analysis of recoil loops. Reversal magnetization in multiphase, nanocomposite permanent magnets, such as annealed Sm 12.5 Fe 8 Co 66.5 Si 2 Cu 11 ribbons, is very complex and often described with more than one type of process.…”

Section: Introductionmentioning

confidence: 99%

Study on the magnetization-reversal behavior of annealed Sm-Fe-Co-Si-Cu ribbons

Dośpial¹,

Garus²,

Nabiałek³

2015

Mater. Tehnol.

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The paper presents the studies of Sm-Fe-Co-Si-Cu ribbons obtained with the melt-spinning technique, annealed at 1123 K for 3 h. The phase-composition studies were made using a D8 Advance Bruker X-ray diffractometer. It was found that the studied alloy has a multi-phase composition. These studies were of crucial importance in the interpretation of the magnetization reversal. Magnetic measurements, i.e., the major hysteresis loop and recoil curves were performed using a LakeShore vibrating-sample magnetometer with the maximum magnetic field of up to 2 T. On the basis of the recoil curves, the hysteresis loop was decomposed into the reversible and irreversible magnetization components. The decomposed curve was used to describe the processes that influence the reversal magnetization in the studied permanent magnets. Further, these components were used to model the recoil curves, using a modified hyperbolic T(x) model based on the method described by Dooepial. The modeled hysteresis loop and recoil curves revealed a high compliance with the experimental data, proving the validity of the assumptions made in the modeling procedure. Keywords: permanent magnets, TbCu 7 structure, magnetization reversal, hysteresis model lanek predstavlja {tudij trakov Sm-Fe-Co-Si-Cu, dobljenih s tehniko "melt-spining", 3 h`arjenih pri 1123 K. [tudij sestave faz je bil izvr{en z rentgenskim difraktometrom D8 Advance Bruker. Ugotovljeno je bilo, da je preu~evana zlitina sestavljena iz vef az. Te {tudije so bile klju~nega pomena pri razlagi obrata magnetizacije. Magnetne meritve, to so glavna histerezna zanka in povratne krivulje, so bile izvr{ene z magnetometrom LakeShore z vibrirajo~im vzorcem z uporabo najve~jih magnetnih polj do 2 T. Na podlagi povratnih krivulj je bila histerezna zanka razdeljena v komponente reverzibilne in ireverzibilne magnetizacije. Razstavljene krivulje so bile uporabljene za opis procesov, ki vplivajo na obrat magnetizacije pri preu~evanih permanentnih magnetih. Nadalje so bile te komponente uporabljene za modeliranje povratnih krivulj z modificiranim hiperboli~nim modelom T(x) na podlagi metode, ki jo je opisal Dooepial. Modelirane histerezne zanke in povratne krivulje so odkrile veliko ujemanje z eksperimentalnimi podatki, kar potrjuje veljavnost pribli`kov, uporabljenih pri razvoju modela. Klju~ne besede: permanentni magneti, strukture TbCu 7, obrat magnetizacije, histerezni model

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Influence of heat treatment on structure and reversal magnetization processes of Sm12.5Co66.5Fe8Cu13 alloy

Cited by 13 publications

References 17 publications

Modeling the Hysteresis Loop of the Nanocomposite Material Using Modified Hyperbolic T(x) Model

Modeling the Hysteresis Loop of the Nanocomposite Material Using Modified Hyperbolic T(x) Model

Magnetization reversal process in (Sm, Dy, Gd) (Co, Fe, Cu, Zr)z magnets with different cellular structures

Study on the magnetization-reversal behavior of annealed Sm-Fe-Co-Si-Cu ribbons

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