Nanofabrication of integrated magnetoelectronic devices using patterned self-assembled copolymer templates

Conventional lithographic exposure is used to selectively degrade regions of a self-assembled diblock copolymer film to obtain a honeycomblike nanoporous array template with arbitrary lateral design. Combined with other lithographic process steps, this enables the fabrication of arrays of nanostructures interfaced to electrical probes for device applications. To demonstrate, a unique magnetotransport device is fabricated, consisting of an array of electrodeposited Co nanowires standing atop a thin gold film patterned into a four-probe resistor configuration. Magnetoresistance measurements, performed at various temperatures and magnetic field orientations, reveal the coexistence of anisotropic magnetoresistance and giant magnetoresistance.

[1]  Ralf B. Wehrspohn,et al.  Hexagonally ordered 100 nm period nickel nanowire arrays , 2001 .

[2]  D. Lederman,et al.  Temperature dependence of the magnetoresistance in Co/Re superlattices on Al 2 O 3 (112̄0) , 2001 .

[3]  K. Guarini,et al.  Ultrahigh-density nanowire arrays grown in self-assembled diblock copolymer templates. , 2000, Science.

[4]  Johnson,et al.  Direct Measurement of the Conduction Electron Spin-Lattice Relaxation Time T1 in Gold. , 1996, Physical review letters.

[5]  J. Ansermet,et al.  ARRAYS OF MULTILAYERED NANOWIRES (INVITED) , 1996 .

[6]  Y. H. Lee,et al.  Studies of anisotropic and giant magnetoresistance in Co/Cu(111) epitaxial multilayers , 1996 .

[7]  Mark Johnson.  Spin polarization of gold films via transported (invited) , 1994 .

[8]  E. Chen,et al.  A method of separating the giant magnetoresistance and the anisotropic magnetoresistance in multilayers , 1993 .

[9]  Jiang,et al.  Giant magnetoresistance in nonmultilayer magnetic systems. , 1992, Physical review letters.

[10]  Young,et al.  Giant magnetoresistance in heterogeneous Cu-Co alloys. , 1992, Physical review letters.

[11]  Pennington,et al.  Observation of spin-polarization effects in disordered metals. , 1992, Physical review. B, Condensed matter.

[12]  E. Velu,et al.  Fuchs-Sondheimer theory as explanation of the magnetoresistance effects in multilayers Au/Co , 1991 .

[13]  Gurney,et al.  Giant magnetoresistive in soft ferromagnetic multilayers. , 1991, Physical review. B, Condensed matter.

[14]  W. M. Haynes.  CRC Handbook of Chemistry and Physics , 1990 .

[15]  Etienne,et al.  Giant magnetoresistance of (001)Fe/(001)Cr magnetic superlattices. , 1988, Physical review letters.

[16]  T. Mcguire,et al.  Anisotropic magnetoresistance in ferromagnetic 3d alloys , 1975 .

[17]  D. MacDonald.  LXXVII. Metallic conduction—The “Internal Size-Effect” , 1951 .