Ferrite Properties and Technology Issues for Improved Microwave Systems

Dionne, Gerald F.; Oates, D.E.

doi:10.1557/proc-833-g4.6

Cited by 2 publications

(3 citation statements)

References 17 publications

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“…Other Jahn-Teller ions with similar magnetoelastic properties include , , and . In more recent work, a microstrip filter concept was demonstrated to be frequency tunable by application of external uniaxial stress applied by a piezoelectric actuator [18], [19]. Fig.…”

Section: Hysteresis Remanence and Coercivitymentioning

confidence: 99%

“…7. Diagrams of tunable microstrip filters that contrast the use of external stress to exploit the magnetoelastic condition K with a more conventional application of variable magnetic bias field [18], [19]. The parameter that characterizes the mechanism for the gyromagnetic loss is the spin-lattice relaxation time , which is usually observed as the intrinsic ferrimagnetic resonance linewidth [1], [20], [21].…”

Section: Microwave Magnetic Loss In Ferritesmentioning

confidence: 99%

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The Magnetoelastic Ion: Friend and Foe to Microwaves

Dionne

2011

IEEE Trans. Magn.

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From the earliest years of ferrite development, spin-lattice interactions from select transition-metal (3d n ) and rare-earth (4f n ) ions have influenced key parameters of microwave device performance. Hysteresis loop squareness and coercivity, and magnetic loss that is related to the ferrimagnetic resonance linewidth will continue to depend on cautious inclusion of ions of the 3d n and 4f n series. As the promise of films and layers for planar devices are made more realizable by rapidly advancing deposition technologies, new challenges appear from the presence of stress imparted by mismatches at film/substrate interfaces. To offset unwanted effects of bias strains, increased use of magnetoelastic ions will become necessary. An additional feature made possible by deposition processing at temperatures lower than those of bulk ceramic sintering or melt-grown single crystals is the stabilization of cation valence states that do not normally occur in the thermodynamic equilibrium of conventional bulk ceramic processing. In the future that will undoubtedly involve structures of steadily decreasing dimensions, ferrite applications will have to account for surface compositional variations and interface stress effects. To this end, this article examines the physics that underlies the possible advantages and potential hazards to microwave technologies of the future, where magnetoelastic 3d n ions Mn 3+ , Fe 4+ , Fe 2+ , Co 4+ , Co 2+ , and Cu 2+ , as well as other ions such as Ho 3+ or Dy 3+ of the 4f n shell can influence the microwave performance.Index Terms-Hysteresis loop design, magnetic anisotropy, magnetostriction, microwave magnetic loss, spin-orbit-lattice interactions.

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Section: Hysteresis Remanence and Coercivitymentioning

confidence: 99%

Section: Microwave Magnetic Loss In Ferritesmentioning

confidence: 99%

The Magnetoelastic Ion: Friend and Foe to Microwaves

Dionne

2011

IEEE Trans. Magn.

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“…This report demonstrates the use of stress to change the magnetization of the ferrite and produce the tuning of a resonator without the application of a magnetic field. Earlier reports have proposed this idea [4,5]. The stress can be applied with a piezoelectric actuator and thus be induced by a voltage that requires no holding current in the static case.…”

Section: Device Descriptionmentioning

confidence: 99%

Voltage tunable microwave ferrite resonator

Oates¹,

Dionne²,

Slattery³

2009

2009 IEEE MTT-S International Microwave Symposium Digest

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A novel method of implementing a tunable resonator using an applied voltage is presented. Stress is used to tune a microstrip resonator fabricated on a polycrystalline ferrite substrate. The stress was applied either mechanically with screws or electronically using piezoelectric actuators. We have demonstrated tunability of 300 MHz using screws and 50 MHz using a piezoelectric actuator at a center frequency of 2.3 GHz. Explanation of the tuning method is given and means to extend the tuning range is discussed. This method opens the possibility of compact low-power tunable filters with wide tuning range at microwave frequencies.

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Ferrite Properties and Technology Issues for Improved Microwave Systems

Cited by 2 publications

References 17 publications

The Magnetoelastic Ion: Friend and Foe to Microwaves

The Magnetoelastic Ion: Friend and Foe to Microwaves

Voltage tunable microwave ferrite resonator

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