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Magnetic Field Sensor Based on Magnetic Tunnel Junction with Voltage-Tunable Magnetic Anisotropy

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Skowroński W., Wiśniowski P., Wrona J., Żywczak A., Stobiecki T.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
496-498
EN
We present a submicron magnetic field sensor with voltage-tunable magnetic field sensitivity. The device, based on magnetic tunnel junction, exhibits high tunnelling magnetoresistance ratio of up to 90%. Perpendicular magnetic anisotropy of thin ferromagnetic sensing layer in combination with an in-plane magnetized reference layer is used to obtain linear change in the sensor resistance in response to the in-plane magnetic field. The perpendicular anisotropy is further controlled by the bias voltage and, thus, the sensitivity of the sensor is changed. In addition, we evaluate the sensor selectivity for the magnetic field direction and present an influence of the temperature on the anisotropy.
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Analysis of preparation for the Paralympics Games in Athens 2004 and Beijing 2008 of athletes with visual impairment, practicing athletics middle distance runs

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Bednarczuk G., Rutkowska I., Molik B., Skowroński W., Morgulec – Adamowicz N.
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vol. 26
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issue 1
67-75
EN
Introduction: Paralympics Games (PG) are most important sports event for athletes with disability. Preparation to the most important start in the season, requires from the coach knowledge about methods and forms of training, the use of which is the foundation for success. Meet the expectations of practitioners (coaches and trainers) and cognitive purposes, one analyzed and evaluated, training in preparation for the IP in 2004 and 2008 athletes with visual impairment (V.I.). Material and methods: The evaluation assessed the two annual cycles of athletes with V.I. (n = 4), practicing athletics middle distance runs, followed the PG in Athens 2004 and Beijing 2008. The method was based on an analysis of trainings documentation which included: number of repetitions used in the training and the way of their implementation. For the analysis was used program TREOB 4.0. Identification and classification of the training was done on the basis of the register groups of training in the middle and long distance runs. Results:Structure of the workout was characterized by intensive use of special means of preparation, carried out in 2 and 3 level of intensity, in both analyzed cycles (respectively 60 and 14 and 56, and 12% of the total loads). It was observed global decline in the volume of training loads, by the increase of training realized in the higher levels of intensity (3 - 5) in the cycle 2007/08 compared to 2003/04 cycle. The dynamics of the dominant groups in both cycles, shows a similar course. It was observed a large volume of training loads during the preparatory period, then its decline as one approach to the starts season. Comparison of results obtained by the athletes in 2004 and 2008, shows increasing levels of their performance in the analyzed group. Conclusions: Comparing the results obtained in 2008, progress has been made in respect of 2004, which may indicate a properly planned and completed the training cycle. The nature (type of work and intensity), the dominant means of training, satisfy the requirements.
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