Cloaking the Static Magnetic Fields by Alternate Superconductor–Ferromagnet Heterostructure

The novel concept to well cloak the incident static magnetic fields by a heterostructure made of a superconductor (SC) and a ferromagnet (FM) has been proposed and verified recently. The performance of such heterostructure strongly depends on the involved materials and its geometrical configurations. We designed and built a practical version of a cylindrical multilayer cloak wound by an alternate SC-FM heterostructure that consists of a coated superconductor and a 1Cr17 ferromagnetic alloy. The cloaking properties of such hybrid against the static magnetic field generated by a Helmholtz coil were measured to verify the related finite-element model, in which the SC constituent is postulated as a diamagnet with relative permeability of less than 1. Using the verified model, we further carried out a set of finite-element simulations with experimentally derived permeability of both the SC and FM constituents to observe the dependence of the cloaking effect as well as the shielding efficiency of the SC-FM heterostructure on its geometry. The obtained characteristics of the magnetic cloaking of the SC-FM hybrid may offer a new paradigm for its applications in the military and medical devices.

[1]  Fedor Gömöry,et al.  Experimental Realization of a Magnetic Cloak , 2012, Science.

[2]  Yuki Sato,et al.  DC Magnetic Cloak , 2012, Advanced materials.

[3]  Y. Genenko,et al.  Magnetic cloaking by a paramagnet/superconductor cylindrical tube in the critical state , 2014, 1403.7917.

[4]  Carles Navau,et al.  Antimagnets: controlling magnetic fields with superconductor–metamaterial hybrids , 2011, 1107.1647.

[5]  C. Navau,et al.  Meissner state in finite superconducting cylinders with uniform applied magnetic field , 1999, cond-mat/9910065.

[6]  Two-dimensional arrays of superconducting strips as dc magnetic metamaterials , 2011, 1112.0372.

[7]  Jordi Prat-Camps,et al.  Experimental realization of magnetic energy concentration and transmission at a distance by metamaterials , 2013, 1308.5878.

[8]  F. Gömöry,et al.  Magnetization loop modelling for superconducting/ferromagnetic tube of an ac magnetic cloak , 2015 .

[9]  C. Navau,et al.  Superconductor–ferromagnetic metamaterials for magnetic cloaking and concentration , 2013 .

[10]  Steven M. Anlage,et al.  The physics and applications of superconducting metamaterials , 2010, 1004.3226.

[11]  Y. Genenko,et al.  Magnetic detectability of a finite size paramagnet/superconductor cylindrical cloak , 2014, 1401.3565.

[12]  J I Cirac,et al.  Long-distance transfer and routing of static magnetic fields. , 2013, Physical review letters.

[13]  Fedor Gömöry,et al.  A quasistatic magnetic cloak , 2013 .

[14]  Jordi Prat-Camps,et al.  Magnetic energy harvesting and concentration at a distance by transformation optics. , 2012, Physical review letters.

[15]  Tie Jun Cui,et al.  A carpet cloak for static magnetic field , 2013 .

[16]  M. Vojenÿ.  Dissipation in Superconductor/Ferromagnet Multilayers for AC Magnetic Cloaking , 2015 .

[17]  J. Šouc,et al.  Magnetic Cloak for Low Frequency AC Magnetic Field , 2014, IEEE Transactions on Applied Superconductivity.