Tb doped CoNbZr soft magnetic films with high anisotropy field for applications in GHz frequency region

The creation of large magnetic fields is a necessary component in many technologies, ranging from magnetic resonance imaging, electric motors and generators, and magnetic hard disk drives in information storage. This is typically done by inserting a ferromagnetic pole piece with a large magnetisation density M S in a solenoid. In addition to large M S , it is usually required or desired that the ferromagnet is magnetically soft and has a Curie temperature well above the operating temperature of the device. A variety of ferromagnetic materials are currently in use, ranging from FeCo alloys in, for example, hard disk drives, to rare earth metals operating at cryogenic temperatures in superconducting solenoids. These latter can exceed the limit on M S for transition metal alloys given by the Slater-Pauling curve. This article reviews different materials and concepts in use or proposed for technological applications that require a large M S , with an emphasis on nanoscale material systems, such as thin and ultra-thin films. Attention is also paid to other requirements or properties, such as the Curie temperature and magnetic softness. In a final summary, we evaluate the actual applicability of the discussed materials for use as pole tips in electromagnets, in particular, in nanoscale magnetic hard disk drive read-write heads; the technological advancement of the latter has been a very strong driving force in the development of the field of nanomagnetism.

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“…• CoZr alloys (e.g., CoZrTa softened by laminating with SiO 2 , 455 and CoNbZr softened by Tb-doping, 456 l 0 M S % 1. 4…”

Section: T)mentioning

confidence: 99%

A review of high magnetic moment thin films for microscale and nanotechnology applications

et al. 2016

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“…It is then decreased for higher x, arisen from the reduction of both saturation magnetization and anisotropy field with the increase of x. The optimal properties obtained for two series alloys are 4pM s = 6.6 kG, H ce = 5. and field induced anisotropy (FIA) method, proper amount of Nb doped into Co 100Àx M x films could exhibit larger H k and higher f FMR , which are superior to the characteristics of Co-based films reported by other research group [11,15,19] and comparable to those of Febased films [9,18]. The above results indicate the possibility of the Co-based films to exhibit excellent high frequency characteristics, provided OD and FIA method are adopted to make the Co-M alloy films with high GFA.…”

Section: Resultsmentioning

confidence: 88%

Magnetic properties and high frequency characteristic of obliquely sputtered Co–M (M=V and Nb) thin films

Chang

Huang

Hsieh

et al. 2012

Journal of Alloys and Compounds

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“…Through oblique deposition and field induced anisotropy method, proper amount of IVB elements doped into Co 100-x M x films could exhibit larger H k and higher f FMR , which are superior to the characteristics of Co-based films reported by other research group 10,14,22 and comparable to those of Fe-based films. 8,21 In conclusion, all Co 100-x M x films exhibit strong induced in-plane magnetic anisotropy.…”

mentioning

confidence: 81%

Study on the soft magnetic properties and high frequency characteristics of Co-M (M = Ti, Zr, and Hf) thin films

Chang

Huang

Hsieh

et al. 2012

Journal of Applied Physics

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Soft magnetic properties and high frequency characteristics of Co100-xMx (M = Ti, Zr, and Hf) thin films have been investigated. All M-doped Co100-xMx films exhibit strong induced in-plane uniaxial magnetic anisotropy. With the increase of the x, the 4πMs and coercivity along the hard and easy axes (Hch and Hce) are decreased, while Hk reaches the maximum value for the films having the composition to become the fully amorphous. Among them, less Hf or Zr content, i.e., x = 7, are sufficient in forming the Co100-xMx amorphous, in contrast, more Ti content, i.e., x = 15, should be needed. The optimal properties of 4πMs = 11.0 kG, Hce = 5.4 Oe, Hch = 4.0 Oe, Hk = 320 Oe and fFMR = 5.2 GHz for Co93Hf7 films and 4πMs = 11.7 kG, Hce = 6.1 Oe, Hch = 1.6 Oe, Hk = 266 Oe and fFMR = 4.9 GHz for Co93Zr7 films can be obtained.

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Tb doped CoNbZr soft magnetic films with high anisotropy field for applications in GHz frequency region

Cited by 8 publications

References 12 publications

A review of high magnetic moment thin films for microscale and nanotechnology applications

A review of high magnetic moment thin films for microscale and nanotechnology applications

Magnetic properties and high frequency characteristic of obliquely sputtered Co–M (M=V and Nb) thin films

Study on the soft magnetic properties and high frequency characteristics of Co-M (M = Ti, Zr, and Hf) thin films

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