Single crystal growth, magnetic properties and Schottky anomaly of HoFeO3 orthoferrite

Shao, Mingjie; Cao, Shixun; Wang, Yabin; Yuan, Shujuan; Kang, Baojuan; Zhang, Jincang; Wu, Anhua; Xu, Jing

doi:10.1016/j.jcrysgro.2010.11.014

Cited by 56 publications

(39 citation statements)

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“…The bulk magnetisation of the same crystal along each of the three principal axes was measured as a function of temperature at several field strengths, The results for the b-axis magnetisation shown in Fig. 2 indicate a spectacular drop at the spin-reorientation transition temperature T ≈ 55 K. The present specific heat and magnetization data accord with previous data 23 for HoFeO 3 and show the expected anomalies associated with the reorientation transition at ≈ 55 K, but give no evidence of any transition at 225 K.…”

Section: Methodssupporting

confidence: 87%

“…Between 55 and 45 K 011 is significantly weaker than 101 although there is no notable change in any of the other reflection intensities. This behaviour confirms that there is a spin reorientation transition at ≈ 55 K. 23 The magnetic space group changes to Pbn2 1 (or Pbnm) and the Fe moments switch to the y direction. Between 40 and 30 K the intensity of the 011 reflection gradually recovers, whilst that of 101 drops very slightly.…”

Section: Temperature Dependence Of Magnetic Scattering From Hofeosupporting

confidence: 56%

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Temperature evolution of magnetic structure of HoFeO3 by single crystal neutron diffraction

2017

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We have investigated the temperature evolution of the magnetic structures of HoFeO 3 by single crystal neutron diffraction. The three different magnetic structures werevfound as a function of temperature for HoFeO 3 . In all three phases the fundamental coupling between the Fe sub-lattices remains the same and only their orientation and the degree of canting away from the ideal axial direction varies. The magnetic polarisation of the Ho sub-lattices in these two higher temperature regions, in which the major components of the Fe moment lie along x and y, is very small. The canting of the moments from the axial directions is attributed to the antisymmetric interactions allowed by the crystal symmetry. In the low temperature phase two further structural transitions are apparent in which the spontaneous magnetisation changes sign with respect to the underlying antiferromagnetic configuration. In this temperature range the antisymmetric exchange energy varies rapidly as the the Ho sub-lattices begin to order. So long as the ordered Ho moments are small the antisymmetric exchange is due only to Fe-Fe interactions, but as the degree of Ho order increases the Fe-Ho interactions take over whilst at the lowest temperatures, when the Ho moments approach saturation the Ho-Ho interactions dominate. The reversals of the spontaneous magnetisation found in this study suggest that in HoFeO 3 the sums of the Fe-Fe and Ho-Ho antisymmetric interactions have the same sign as one another, but that of the Ho-Fe terms is opposite. © 2017 Author (s)

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Section: Methodssupporting

confidence: 87%

Section: Temperature Dependence Of Magnetic Scattering From Hofeosupporting

confidence: 56%

Temperature evolution of magnetic structure of HoFeO3 by single crystal neutron diffraction

2017

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“…The crystals were of very good quality giving sharp diffraction peaks. Magnetization and specific heat measurements on a small 122 mg single crystal of HoFeO 3 cut out of the larger single crystal have been reported by us [13] and these results are in agreement with the results reported by other authors [18]. We have also previously reported [13] the temperature evolution of the magnetic structure of these same HoFeO 3 crystals using unpolarized neutron diffraction.…”

Section: Crystal Growth and Characterizationsupporting

confidence: 91%

Single crystal polarized neutron diffraction study of the magnetic structure of HoFeO₃

Chatterji

Stunault

Brown

2017

J. Phys.: Condens. Matter

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Abstract. Polarised neutron diffraction measurements have been made on HoFeO 3 single crystals magnetised in both the [001] and [100] directions (P bnm setting). The polarisation dependencies of Bragg reflection intensities were measured both with a high field of H = 9 T parallel to [001] at T = 70 K and with the lower field H = 0.5 T parallel to [100] at T = 5, 15, 25 K. A Fourier projection of magnetization induced parallel to [001], made using the hk0 reflections measured in 9 T, indicates that almost all of it is due to alignment of Ho moments. Further analysis of the asymmetries of general reflections in these data showed that although, at 70 K, 9 T applied parallel to [001] hardly perturbs the antiferromagnetic order of the Fe sublattices, it induces significant antiferromagnetic order of the Ho sublattices in the x-y plane, with the antiferromagnetic components of moment having the same order of magnitude as the induced ferromagnetic ones. Strong intensity asymmetries measured in the low temperature Γ 2 structure with a lower field, 0.5 T [100] allowed the variation of the ordered components of the Ho and Fe moments to be followed. Their absolute orientations, in the 180• domain stabilised by the field were determined relative to the distorted perovskite structure,. This relationship fixes the sign of the Dzyalshinski-Moriya (D-M) interaction which leads to the weak ferromagnetism. Our results indicate that the combination of strong y-axis anisotropy of the Ho moments and Ho-Fe exchange interactions breaks the centrosymmetry of the structure and could lead to ferroelectric polarization.PACS numbers: 75.30.Gw HoFeO 3 , polarized neutrons,weak-antiferromagnetism/ Polarised Neutron diffraction study of HoFeO 3

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“…Realizing the potential of multifunctional properties and tunable physical properties in R 2 BB O 6 , we carry out an experimental investigation of Ho 2 FeCoO 6 in the present paper. The well-studied end members of Ho 2 FeCoO 6 are orthorhombic HoFeO 3 and HoCoO 3 [13,14] which are weak ferromagnets with the rare earth Ho 3+ ordering magnetically at ≈ 4.1 K and ≈ 3 K respectively [15,13]. The orthoferrites RFeO 3 generally have high Néel temperatures of the order of ∼ 700 K [16,17] and in bulk form are not multiferroic though, recent theoretical calculations on thin films show the emergence of electric polarization with the application of strain [18].…”

Section: Introductionmentioning

confidence: 99%

“…The orthoferrites RFeO 3 generally have high Néel temperatures of the order of ∼ 700 K [16,17] and in bulk form are not multiferroic though, recent theoretical calculations on thin films show the emergence of electric polarization with the application of strain [18]. In the orthoferrite HoFeO 3 spin reorientation of the Fe moments is reported in the temperature ranges 50 K -58 K [13] and 34 K -54 K [19], caused by Ho 3+ -Fe 3+ interactions and competing Zeeman and van Vleck contribution to the anisotropy that initiates the Fe spin reorientation. When the B/B -site is substituted with other transition metal cations like Cr or Mn, changes in the spin reorientation temperature are observed [20,21].…”

Section: Introductionmentioning

confidence: 99%

Spin reorientation and disordered rare earth magnetism in Ho₂FeCoO₆

Haripriya

Nair

Pradheesh

et al. 2017

J. Phys.: Condens. Matter

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Abstract. We report the experimental observation of spin reorientation in the double perovskite Ho 2 FeCoO 6 . The magnetic phase transitions in this compound are characterized and studied through magnetization and specific heat, and the magnetic structures are elucidated through neutron powder diffraction. Two magnetic phase transitions are observed in this compound -one at T N1 ≈ 250 K, from paramagnetic to antiferromagnetic, and the other at T N2 ≈ 45 K, from a phase with mixed magnetic structures to a single phase through a spin reorientation process. The magnetic structure in the temperature range 200 K -45 K is a mixed phase of the irreducible representations Γ 1 and Γ 3 , both of which are antiferromagnetic. The phase with mixed magnetic structures that exists in Ho 2 FeCoO 6 gives rise to a large thermal hysteresis in magnetization that extends from 200 K down to the spin reorientation temperature. At T N2 , the magnetic structure transforms to Γ 1 . Though long-range magnetic order is established in the transition metal lattice, it is seen that only short-range magnetic order prevails in Ho 3+ -lattice. Our results should motivate further detailed studies on single crystals in order to explore spin reorientation process, spin switching and the possibility of anisotropic magnetic interactions giving rise to electric polarization in Ho 2 FeCoO 6 .

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Single crystal growth, magnetic properties and Schottky anomaly of HoFeO3 orthoferrite

Cited by 56 publications

References 20 publications

Temperature evolution of magnetic structure of HoFeO3 by single crystal neutron diffraction

Temperature evolution of magnetic structure of HoFeO3 by single crystal neutron diffraction

Single crystal polarized neutron diffraction study of the magnetic structure of HoFeO₃

Spin reorientation and disordered rare earth magnetism in Ho₂FeCoO₆

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Single crystal growth, magnetic properties and Schottky anomaly of HoFeO3 orthoferrite

Cited by 56 publications

References 20 publications

Temperature evolution of magnetic structure of HoFeO3 by single crystal neutron diffraction

Temperature evolution of magnetic structure of HoFeO3 by single crystal neutron diffraction

Single crystal polarized neutron diffraction study of the magnetic structure of HoFeO3

Spin reorientation and disordered rare earth magnetism in Ho2FeCoO6

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Product

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Single crystal polarized neutron diffraction study of the magnetic structure of HoFeO₃

Spin reorientation and disordered rare earth magnetism in Ho₂FeCoO₆