Analysis and contribution of stress anisotropy in epitaxial hard ferrite thin films

Lisfi, A.; Nguyen, Long Thang; Lodder, J.C.; Williams, C. M.; Corcoran, H.; Chang, Po Chun; Johnson, A.; Morgan, W. A.

doi:10.1016/j.jmmm.2004.11.187

Cited by 7 publications

(5 citation statements)

References 7 publications

(8 reference statements)

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“…The relationships among stress, magnetostriction, magnetic anisotropy, growth, and processing of thin magnetic films is a topic of long-standing interest in magnetism. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] The impact on the saturation field of the sense layer is an important issue for magnetic sensors based on magnetoresistance effects. To detect small magnetic fields, these sensors need to incorporate a sense layer that is magnetically soft.…”

Section: Introductionmentioning

confidence: 99%

400-fold reduction in saturation field by interlayering

Egelhoff

Bonevich

Pong

et al. 2009

Journal of Applied Physics

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The buildup of stress with increasing thickness of magnetic thin films is a common phenomenon that often induces undesirable anisotropies that can convert an otherwise magnetically soft film into a magnetically hard one. We found that by interlayering such a magnetic thin film with films that are either not lattice matched or have a different crystal structure, reductions in the saturation field as large as 400-fold can be achieved. Differences in grain size appear to be responsible.

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Section: Introductionmentioning

confidence: 99%

400-fold reduction in saturation field by interlayering

Egelhoff

Bonevich

Pong

et al. 2009

Journal of Applied Physics

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“…Comparing the films prepared in this work and those of Ref. [12,[16][17][18][20][21][22][23][24][25], we can note that the films obtained by tape-casting in Ref. [12] are characterized by more larger grain sizes.…”

Section: Resultsmentioning

confidence: 67%

“…In particular, authors [12] indicate that films are weakly textured and contain pores. Films obtained in [20][21][22][23][24][25] by physical deposition methods are also characterized by a large grain size and pores. Furthermore, these films have lower magnetic properties (M s , H c ) in comparison with the films of this study.…”

Section: Resultsmentioning

confidence: 99%

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The effect of sol–gel preparation conditions on structural characteristics and magnetic properties of M-type barium hexaferrite thin films

Solovyova¹,

Calzada

Belous³

2015

J Sol-Gel Sci Technol

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We have shown the possibility to obtain M-type barium hexaferrite thin films with thickness of *200-450 nm on the surface of dielectric a-Al 2 O 3 substrates with low microwave dielectric loss (tan d * 10 -4 GHz) by a sol-gel method. For the production of high-dense homogeneous thin films of M-type barium hexaferrite (BaFe 12 O 19 , BHF) with nanorod-like grains and a uniform distribution of iron and barium ions, we have studied the synthesis conditions for thermally stable filmforming solutions with high concentrations of barium ions. Films with a c-axis magnetic texture were obtained by spin-coating the former solutions on a-Al 2 O 3 substrates and annealing at temperatures between 473 and 1073 K. The resulting textured M-type BHF films have demonstrated the following magnetic parameters: H c\ = 334 kA/ m, H c|| = 167 kA/m; M s\ = 0.005 emu, M s|| = 0.003 emu for the films' thickness of *200 nm, and H c\ = 360 kA/ m, H c|| = 338 kA/m; M s\ = 0.009 emu, M s|| = 0.007 emu for the films' thickness of *450 nm. These M-type BHF thin films can serve as a promising basis for further development of multilayer microwave resonant elements. Graphical Abstract

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“…Some of the important requirements to M-type BHF thin films for use in different systems are high values of coercive force H c (> 240 kA/m), small grain size and thickness of the film. At present, different methods for the synthesis of M-type barium ferrite films are known which have a number of disadvantages [7]. One of the promising methods for the synthesis of BHF films is sol-gel method.…”

Section: Introductionmentioning

confidence: 99%

Properties and Potential Applications of Ferromagnetic Nanostructures in Medicine and Microwave Engineering

Belous

Solovyova

Solopan

et al. 2015

SSP

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Three types of ferromagnetic nanostructures based on barium hexaferrite (BaFe12O19), lanthanum-strontium manganites with perovskite structure ((La,Sr)MnO3) and materials with spinel structure (AFe2O4, A = Ni, Zn, Co, Mn, Fe) have been synthesized by precipitation from aqueous and nonaqueous solutions, by the sol-gel method and from microemulsions. Magnetic properties of the synthesized nanoparticles and films have been investigated. It was shown that the obtained nanoparticles exhibit superparamagnetic properties. It has been found that the synthesized nanoparticles have promise in hyperthermia of cancer cells. It has been shown that the films based on barium hexaferrite can have promise in the creation of nonlinear resonant microwave elements on the basis of high-Q dielectric resonators and ferromagnetic films.

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Analysis and contribution of stress anisotropy in epitaxial hard ferrite thin films

Cited by 7 publications

References 7 publications

400-fold reduction in saturation field by interlayering

400-fold reduction in saturation field by interlayering

The effect of sol–gel preparation conditions on structural characteristics and magnetic properties of M-type barium hexaferrite thin films

Properties and Potential Applications of Ferromagnetic Nanostructures in Medicine and Microwave Engineering

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