Article
Spontaneous rotation of magnets levitating above high-Tc superconductor
D. M. Gokhfeld
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russia
Krasnoyarsk State Pedagogical University, 660049 Krasnoyarsk, Russia
e-mail: gokhfeld@iph.krasn.ru
S. Yu. Shalomov
Phys.-Math. School, Siberian Federal University, 660041 Krasnoyarsk, Russia
D. B. Sultimov
Krasnoyarsk State Pedagogical University, 660049 Krasnoyarsk, Russia
M. I. Petrov
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russia
Abstract
Levitation of a cylindrical permanent magnet over a high-temperature superconductor cooled by liquid nitrogen can be accompanied by spontaneous oscillations and rotation. The reason for spontaneous rotation of the magnet is magnetization inhomogeneity induced by the temperature gradient. An experiment was carried out on the levitation of Nd–Fe–B magnets over a composite high-temperature superconductor. The experimental results confirm that the rotation frequency depends on the difference in the magnetization values in its upper and lower halves of the magnet. Methods for controlling the rotation frequency of a levitating magnet are proposed.
Keywords: heat machine; levitation; REBCO; composite superconducting tape; NdFeB.
References
[1] V. Arkadiev, Nature 160, 330 (1947). DOI: 10.1038/160330a0
[2] C. P. Strehlow and M. C. Sullivan, Am. J. Phys. 77, 847 (2009). DOI: 10.1119/1.3095809
[3] S. Miryala and M. R. Koblischka, Eur. J. Phys. Educ. 5, 1 (2014).
[4] F. Moon, Superconducting Levitation: Applications to Bearings and Magnetic Transportation (WILEY-VCH, 1994).
[5] G. Martini, A. Rivetti, and F. Pavese, Adv. Cryog. Eng. 35, 639 (1990). DOI: 10.1007/978-1-4613-0639-9_75
[6] K. B. Ma, J. R. Liu, C. McMichael, R. Bruce, D. Mims, and W. K. Chu, J. Appl. Phys. 70, 3961 (1991). DOI: 10.1063/1.349158
[7] J. E. Hirsch and D. J. Hirsch, Phys. C Supercond. 398, 8 (2003). DOI: 10.1016/S0921-4534(03)01204-8
[8] M. Schreiner, Rev. Matemática Complut. 16, 495 (2003). DOI: 10.5209/rev_REMA.2003.v16.n2.16826
[9] M. Schreiner and C. Palmy, Am. J. Phys. 72, 243 (2004). DOI: 10.1119/1.1604385
[10] M. Schreiner, Appl. Math. Model. 31, 854 (2007). DOI: 10.1016/j.apm.2006.02.006
[11] S. Lee, V. Petrykin, A. Molodyk, S. Samoilenkov, A. Kaul, A. Vavilov, V. Vysotsky, and S. Fetisov, Supercond. Sci. Technol. 27, 044022 (2014). DOI: 10.1088/0953-2048/27/4/044022