Utilizing alternate target deposition to increase the magnetoelectric effect at room temperature in a single phase M-type hexaferrite

Izadkhah, Hessam; Zare, Saba; Sivasubramanian, S.; Lombardi, Fabrizio; Vittoria, C.

doi:10.1557/mrc.2017.36

Cited by 9 publications

(2 citation statements)

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“…Mechanism for its realization is also important [11][12][13][14]. This question presents both fundamental scientific interest and it is important from a practical point of view [15][16][17][18][19][20][21][22][23][24][25]. Some controversy about ferroelectricity in the M-type hexaferrites exists [26].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and dipole moments in indium doped barium hexaferrites

Trukhanov

Турченко

Труханов

et al. 2018

Journal of Magnetism and Magnetic Materials

118

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Crystal and magnetic structure of the doped BaFe12-xInxO19 samples were refined by the results of investigations using high resolution neutron powder diffraction and vibration sample magnetometry at different temperatures. The refinements were realized in frame of two space groups. The P63/mmc (No 194) centrosymmetric nonpolar and P63mc (No 186) noncentrosymmetric polar space groups were used. The unit cell parameters, ionic coordinates, thermal isotropic factors, occupation positions, bond lengths and bond angles, microstrain values were established. The magnetic and dipole moments were also defined. It is established that the In3+ cations may be located only in the Fe1 -2a and Fe2 -2b crystallographic positions with equal probability for the sample with lowest substitution level x = 0.1. At the x = 1.2 substitution level about half of the In3+ cations occupies the Fe5 -12k positions. For the last sample the remaining half of the In3+ cations is equiprobably located in the Fe1 -2a and Fe2 -2b positions. The spontaneous polarization was established for these compositions at 300 K. It is studied the influence of the type of substitutive cation and structural parameters on the Fe3+(i) -O2--Fe3+(j) (i, j = 1, 2, 3, 4, 5) indirect superexchange interactions with temperature. With substitution level increase the superexchange interactions between the magnetic positions inside and outside the sublattices are broken which leads to a decrease in the value of their magnetic moments.

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Section: Introductionmentioning

confidence: 99%

Magnetic and dipole moments in indium doped barium hexaferrites

Trukhanov

Турченко

Труханов

et al. 2018

Journal of Magnetism and Magnetic Materials

118

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“…There are eight spin-up and four spin-down moments in each unit cell, with the magnetic moment of each Fe 3+ ion being 5 μ B at absolute zero. Therefore, the magnetism of each unit cell is expected to be 4*5µ B 20µ B (Figure 1) (Zi et al, 2008;Harris, 2012;Izadkhah et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Structure and Magnetization of Strontium Hexaferrite (SrFe12O19) Films Prepared by Pulsed Laser Deposition

khoo

Kameli

2021

Front. Mater.

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M-type strontium hexaferrite (SrM) thin films show excellent magnetic properties and uniaxial magnetic anisotropy. We systematically investigated the magnetism of SrM films prepared by pulsed-laser deposition on different substrates [Al2O3 (11¯02), SrTiO3 (100), ZnO (0001), and LiNbO3 (0001)] at vacuum (10−4 Pa) and a substrate temperature of 800°C. Prepared films were annealed in air at a temperature of 1,000°C for 2 hours. This investigation determined the effect of annealing and different substrates on the morphology, strain, and hysteresis loops of the films. The prepared films were characterized using x-ray diffractometry, Raman spectroscopy, scanning electron microscopy, and superconducting quantum interference device (SQUID) magnetometry. X-ray diffraction analyses confirmed c-oriented growth along the out-of-plane direction in most films. We found that annealing causes enhanced crystallization in films and a significant increase in coercivity. The highest coercivity of ∼11 KOe was measured for the film deposited on the Al2O3 (11¯02) substrate.

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