Temperature modulation of the antiferromagnetic susceptibility of high purity single-crystal terbium

McKenna, T.J.; Campbell, S. J.; Chaplin, D. H.; Wilson, G. V. H.

doi:10.1088/0953-8984/3/12/016

Cited by 7 publications

(3 citation statements)

References 18 publications

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“…In the HAM phase, the contribution of the anisotropy is very small and the spiral wall energy is mainly dominated by exchange energy. According to a simple calculation taking account of the temperature variation of helical turn angle, the number of magnetic moments which comprise a spiral domain wall decreases with temperature and the wall energy maximizes around 120-130 K [27]. This implies that the energy to overcome the pinning potential is high at around this temperature, being consistent with the high value of W …”

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confidence: 61%

Universal Hysteresis Scaling for Incommensurate Magnetic Order in Dysprosium

Kobayashi

2011

Phys. Rev. Lett.

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We study the scaling properties of magnetic minor hysteresis loops in a polycrystalline dysprosium metal, varying temperature and magnetic-field amplitudes. We observe irreversibility-related hysteresis loss in the helical antiferromagnetic phase, which is related with remanent flux density as a power law with the same scaling exponent of 1:25 AE 0:05 as that in ferromagnetic materials. In contrast to hysteresis scalings in ferromagnets associated with 180Bloch walls, the observed law is governed by spiral walls which separate helical domains with oppositely rotating spins. DOI: 10.1103/PhysRevLett.106.057207 PACS numbers: 75.60.Ej, 75.60.Ch Magnetic domain wall, an interfacial region which separates domains with opposite magnetization, has been widely and extensively studied because of their technological and engineering applications such as future spintronics device and fundamental physical importances [1,2]. Their static and dynamical motion has led to diverse universal and scaling phenomena in Barkhausen avalanches [3][4][5], the field-velocity characteristics [6], and hysteresis behavior [7][8][9][10][11][12]. In particular, magnetic hysteresis loops, which reflect irreversible wall motion under pinning fields, have been shown to exhibit scaling power laws in their hysteresis parameters. For instance, for thin ferromagnetic films, dynamical hysteresis loop area A has been shown to relate with applied field strength H, frequency , and temperature T as A / H T À or A / ðdH=dtÞ with scaling exponents , , and [7][8][9]. On the other hand, for bulk ferromagnets, the empirical Steinmetz law, which relates static loop area, i.e., hysteresis loss W 1:6 , has been long known [10][11][12]. Nevertheless, all scaling laws are generally governed by the motion of 180 domain walls and have only been observed in ferromagnetic materials.In this Letter, we report the first observation of a scaling power law of magnetic hysteresis loops in a helical incommensurate magnetic phase with spins rotated from atomic layer to layer and with no net spontaneous magnetization. The observed law is governed by motion of spiral walls which separate helical domains with spins rotating clockwise or anticlockwise. We have focused on a bulk sample of heavy rare-earth metal Dy which shows a rich magnetic-temperature phase diagram with various types of magnetic ordering [13][14][15][16][17]. Below a Néel temperature of T N $ 180 K, Dy exhibits a helical antiferromagnetic (HAM) structure where magnetic moments confined on the hexagonal basal planes rotate from basal plane to basal plane. With decreasing temperature, the turn angle between the adjacent planes decreases from about 43.2 to 26.5 and the magnetic phase transition toward the ferromagnetic (FM) phase takes place at T c $ 90 K below which all the magnetic moments align ferromagnetically along the a axis. These magnetically ordered phases are stabilized as a consequence of magneto-crystalline anisotropy energy, magnetostriction energy, and long-range competing exchange interactions [1...

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confidence: 61%

Universal Hysteresis Scaling for Incommensurate Magnetic Order in Dysprosium

Kobayashi

2011

Phys. Rev. Lett.

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“…According to simple calculations, 12,24,25 the width of the spiral wall is only a few atomic layers and decreases with a helical turn angle θ 0 : for instance, approximately five atomic layers for Ho when θ 0 = 36…”

Section: Discussionmentioning

confidence: 99%

“…5 These observations indicate a universal hysteresis scaling due to an irreversible process of spiral domain walls, which separate HAM domains with oppositely rotating spins. [9][10][11][12] The scaling coefficient gave information about the pinning fields for spiral domain walls, which may be related with the turn angle of the HAM structure. These findings open up the possibility of investigating the pinning mechanism using hysteresis scaling, not only for Bloch walls that are typical in ferromagnets, but also for other types of domain walls present in antiferromagnetic structures such as HAM, conical, and sinusoidal ones.…”

Section: Introductionmentioning

confidence: 99%

Magnetic hysteresis scaling behavior in terbium and holmium

Kobayashi

2011

Phys. Rev. B

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Hysteresis scaling for magnetic minor loops has been examined in the heavy rare-earth metals Tb and Ho, varying the temperature and magnetic-field amplitudes. In addition to the low-temperature ferromagnetic phase below T c , the scaling law between the hysteresis loss and remanent flux density with an exponent of ∼1.3 was observed in the higher-temperature helical antiferromagnetic phase for both metals. The coefficient which reflects the pinning fields of the domain walls decreases with increasing temperature below T c , but it exhibits a sharp increase after the onset of the helical antiferromagnetic phase. The observations above T c were explained as due to the irreversible motion of spiral domain walls, unlike the 180• Bloch walls that are typical in the ferromagnetic phase.

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Drulis¹,

Drulis²

Rare Earth Elements, Alloys and Compounds

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Temperature modulation of the antiferromagnetic susceptibility of high purity single-crystal terbium

Cited by 7 publications

References 18 publications

Universal Hysteresis Scaling for Incommensurate Magnetic Order in Dysprosium

Universal Hysteresis Scaling for Incommensurate Magnetic Order in Dysprosium

Magnetic hysteresis scaling behavior in terbium and holmium

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