Magnetization processes in Nd4Fe77B19 permanent magnetic materials

Schneider, J.; Eckert, D.; Müller, K.‐H.; Handstein, A.; Mühlbach, H.; Sassik, H.; Kirchmayr, H.

doi:10.1016/0167-577x(90)90129-a

Cited by 38 publications

(7 citation statements)

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“…This characteristic is generally considered to be the criterion for the presence of the exchange-spring mechanism. [2][3][4][5] It originates from the nearly reversible rotation of the Sm 2 Co 17 phase and fcc-Co phase for fields not high enough to reverse the SmCo 5 phase and Sm 2 Co 17 phase, respectively. The splitting or opening of the recoil curves, especially for 100% Sm 2 Co 17 , is indicative of irreversible behavior.…”

Section: B Magnetic Propertiesmentioning

confidence: 99%

“…[1][2][3][4][5][6] This effect was discovered in melt-spun Nd 4 Fe 78 B 18 mainly consisting of Fe 3 B and Nd 2 Fe 14 B. 1 Although these materials consist of, at least, two ferromagnetic phases, their demagnetization curves have a shape like those of typical single-phase materials which is due to a strong magnetic interaction between the phases.…”

Section: Introductionmentioning

confidence: 95%

“…are very steep. 5 This so-called springmagnet behavior as well as the remanence enhancement and the single-phase behavior have been well explained by taking into account exchange coupling between the small grains of the magnetic phases. 2 Many remanence-enhanced magnets based on nanocrystalline mixtures of the hard and soft phases have been investigated.…”

Section: Introductionmentioning

confidence: 98%

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Microstructure and magnetization reversal in nanocomposite SmCo5/Sm2Co17 magnets

Yan

Bollero

Gutfleisch

et al. 2002

Journal of Applied Physics

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A comparative investigation has been made of the microstructure and magnetization reversal behavior of nanocomposite SmCo 5 /Sm 2 Co 17 powders prepared by intensive milling and subsequent annealing. It was found that the saturation magnetization increases monotonically with the increase of the volume fraction of Sm 2 Co 17 at the expense of the coercivity. However, the remanence and the energy product first increase and then decrease with further increase of the fraction of Sm 2 Co 17 . The highest remanence of 0.72 T and energy product of 78 kJ/m 3 are obtained in the powders with 80% and 60% Sm 2 Co 17 , respectively. All the hysteresis loops exhibit a magnetically single-phase behavior. X-ray diffraction results reveal that the coexistence of two phases is found in the mixture of SmCo 5 /Sm 2 Co 17 powders. The demagnetization processes of the SmCo 5 /Sm 2 Co 17 powders are similar to those of nanocomposites consisting of hard and soft phases, in which the exchange-spring magnet behavior was observed. Positive as well as negative deviations in Wohlfarth's remanence analysis ͑␦M -plot͒ have been observed, indicating complex magnetic interactions in these materials.

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Section: B Magnetic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 98%

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Microstructure and magnetization reversal in nanocomposite SmCo5/Sm2Co17 magnets

Yan

Bollero

Gutfleisch

et al. 2002

Journal of Applied Physics

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“…4(c) becomes narrow and close to the field axis similar to the reversible curves in Fig. 8 and to the recoil loops observed in exchange spring materials [12,13,20].…”

Section: Discussionmentioning

confidence: 60%

“…Although the anisotropy axes of both particles have been chosen parallel to each other and to the magnetic field non-collinear reversal modes have been obtained. Similar modes are known from non-textured nanocomposite exchange-spring magnets [13][14][15]. Depending on the interaction strength, the reversal may be cooperative or noncooperative also in the regime of this kind of exchange-spring behaviour (see Fig.…”

Section: Discussionmentioning

confidence: 93%