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

Journal Article · · Applied Physics Reviews
DOI:https://doi.org/10.1063/1.4941311· OSTI ID:1338947
ORCiD logo [1]; ORCiD logo [2];  [3];  [3];  [3]; ORCiD logo [4]
  1. Weizmann Inst. of Science, Rehovot (Israel); Queen's Univ. of Belfast, Belfast (United Kingdom)
  2. Argonne National Lab. (ANL), Lemont, IL (United States); Northwestern-Argonne Institute of Science and Technology, Evanston, IL (United States)
  3. Seagate Technology (Ireland), Derry (United Kingdom)
  4. Queen's Univ. of Belfast, Belfast (United Kingdom)

Here, 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 MS in a solenoid. In addition to large MS, 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 MS 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 MS, 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22) Materials Sciences and Engineering Division; USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1338947
Alternate ID(s):
OSTI ID: 1238297
Journal Information:
Applied Physics Reviews, Vol. 3, Issue 1; ISSN 1931-9401
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 113 works
Citation information provided by
Web of Science

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Ferromagnetism in GaN:Gd: A Density Functional Theory Study journal March 2008
Magnetism in GaN layers implanted by La, Gd, Dy and Lu journal July 2011
Ga vacancy induced ferromagnetism enhancement and electronic structures of RE-doped GaN journal September 2012
Structural, morphological and magnetic characteristics of Tb-implanted GaN and AlGaN films journal April 2013
Ferromagnetic and paramagnetic magnetization of implanted GaN:Ho,Tb,Sm,Tm films journal May 2015
Magnetic susceptibility of the rare earth element impurities in the IV–VI semiconductors and Curie–Weiss law journal January 2010
Gd on GaN(0001) surface: Growth, interaction, and Fermi level movement journal January 2003
Magnetically aligned polycrystalline dysprosium as ultimate saturation ferromagnet for high magnetic field polepieces journal May 1995
Intermetallic compounds of rare-earth and 3d transition metals journal October 1977
Intermetallic compounds of rare earths and non-magnetic metals journal August 1979
Thermal Hysteresis of Thin Dy Films journal October 2006
Structure and magnetic properties of nanostructured Dy/transition‐metal multilayered films journal November 1988
Magnetic rare‐earth superlattices (invited) journal April 1988
Lanthanide contraction and magnetism in the heavy rare earth elements journal April 2007
Magnetic properties of amorphous rare-earth – 3d-transition-metal alloys journal June 1997
Magnetic Properties of Dilute Alloys of Scandium journal March 1971
Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium journal April 1973
Die legierungen des rutheniums mit gadolinium und dysprosium und ihre magnetischen eigenschaften journal April 1976
Magnetische eigenschaften der legierungen des rhodiums mit lanthaniden journal October 1975
Das system gadolinium-rhodium und legierungen des rhodiums mit anderen lanthaniden journal April 1976
Propriétés magnétiques des composés équiatomiques terres rares rhodium TRh (T  Tb, Dy, Ho, Er) journal January 1972
Structures magnetiques des composes equiatomiques terres rares-rhodium T Rh(T = Dy, Ho, Er) journal April 1972
Ferromagnetism in DyRh and DyRhX (X = Fe, Ni, Co, Gd) thin films journal November 2014
Magnetism in Gd–W films journal May 2008
Magnetic properties, anisotropy, and microstructure of sputtered rare‐earth iron multilayers journal April 1988
Domain walls and exchange-interaction in Permalloy/Gd films journal January 2008
Enhanced exchange and reduced magnetization of Gd in an Fe/Gd/Fe trilayer journal September 2011
Magneto-optical recording journal August 2001
Thickness dependence of magnetic properties in GdDy/FeCo film journal November 1993
Magnetization of the Rare‐Earth Manganese Compounds R 6 Mn 23 journal March 1965
Magnetic Moments of Alloys of Gadolinium with Some of the Transition Elements journal May 1960
MAGNETIC ORDER OF THE COMPOUND SERIES RE 6 (Mn x Fe 1-x ) 23 (RE = Y, Gd) journal February 1971
Indirect exchange for rare earths in metals journal May 1972
Magnetic interactions in R 6 Mn 23 rare earth intermetallics journal March 1979
Forcing Ferromagnetic Coupling Between Rare-Earth-Metal and 3 d Ferromagnetic Films journal April 2010
Textured growth of the high moment material Gd(0 0 0 1)/Cr(0 0 1)/Fe(0 0 1) journal June 2011
Magnetic Properties of the System Fe 2 P-Mn 2 P journal April 1973
Overview of Magnetic Properties of NiAs-Type (MnP-Type) and Cu2Sb-Type Compounds book January 2009
Magnetic Properties of Rare‐Earth Compounds journal March 1967
Interlayer coupling in Fe/Cr/Gd multilayer structures journal June 2015
Magnetic moments in ultrathin Cr films on Fe(100) journal March 1994
Cr magnetic moments in Fe–Cr layered structures journal August 1997
Role of noncollinearity of Cr magnetic moment distribution in Fe/Cr superlattices journal April 2013
Magnetic properties of Gd/Fe and Fe/Gd bilayer systems journal June 1997
Spin structures of Fe/Gd and Fe/Cr multilayers determined by polarized neutron reflectometry journal March 1993
Electron correlation effects and magnetic ordering at the Gd(0001) surface journal April 2000
Magnetic nanoparticles journal October 1999
Magnetic structure of free iron clusters compared to iron crystal surfaces journal November 2004
Magnetic properties of free Fe clusters at finite temperatures from first principles journal June 2006
Magnetic moment and anisotropy in FenCom clusters journal June 2002
Magnetic moments of iron clusters with 25 to 700 atoms and their dependence on temperature journal December 1993
Doubling of the orbital magnetic moment in nanoscale Fe clusters journal July 1999
Enhancements in magnetic moments of exposed and Co-coated Fe nanoclusters as a function of cluster size journal May 2002
High-moment films produced by assembling nanoclusters journal January 2002
Realizing high magnetic moments in fcc Fe nanoparticles through atomic structure stretch journal April 2012
Ultrafine particles of Fe, Co, and Ni ferromagnetic metals journal April 1991
High-magnetic-moment core-shell-type FeCo–Au∕Ag nanoparticles journal October 2005
FeCo/graphitic-shell nanocrystals as advanced magnetic-resonance-imaging and near-infrared agents journal November 2006
Giant Enhancement and Anomalous Thermal Hysteresis of Saturation Moment in Magnetic Nanoparticles Embedded in Multiwalled Carbon Nanotubes journal May 2013
Magnetic Moment Enhancement at Transition Metal and Rare-Earth Metal Surfaces journal January 1991
Stability and Hydrogenation of ?Bare? Gadolinium Nanoparticles journal January 2005
Magnetism of free Transition Metal and rare Earth Clusters journal February 1993
Magnetic and structural properties of isolated and assembled clusters journal February 2005
Preparation, microstructure, and magnetic properties of bulk nanocrystalline Gd metal journal December 2006
Influence of nanostructure (layers and particles) on the magnetism of rare-earth materials journal April 1999
Magnetic anisotropy in nanostructured gadolinium journal March 2012
Finite size effects in nanoscale Tb particles journal January 1996
Grain size effects in nanocrystalline materials journal August 1992
Antiferromagnetic grain volume effects in metallic polycrystalline exchange bias systems journal May 2008
The reversible susceptibilities of dysprosium and terbium journal February 1974
Non-equilibrium materials design: a case study of nanostructured soft magnets for cryogenic applications journal May 2014
High frequency initial permeability of NiFe and FeAlN journal July 1998
Electrodeposition of low-stress high magnetic moment Fe-rich FeCoNi thin films journal February 2006
Magnetic and structural characterization and ferromagnetic resonance study of thin film HITPERM soft magnetic materials for data storage applications journal May 2003
Nanocrystalline Fe 88−2 x Co x Ni x Zr 7 B 4 Cu 1 alloys: Soft magnets for vehicle electrification technologies (invited) journal May 2015
The high‐resistive soft magnetic amorphous films consisting of cobalt, iron, boron, silicon, and oxygen, utilized for video head devices journal May 1990
Fabrication and performance of high moment laminated FeAlN thin film inductive recording heads journal March 1994
Optimization of ultra-soft CoZrTa/SiO 2 /CoZrTa trilayer elements for integrated inductor structures journal May 2013
Tb doped CoNbZr soft magnetic films with high anisotropy field for applications in GHz frequency region journal September 2008
Roadmap for Emerging Materials for Spintronic Device Applications journal October 2015
Thermal hysteresis of thin Dy films conference May 2006
Ferromagnetism and antiferromagnetism of rare-earth metals [Ферро- и антиферромагнетизм редкоземельных металлов] journal January 1964
Compositional Variation of Saturation Magnetization for Fe-N Thin Films with Respect to Nitrogen. [Fe‐N薄膜の飽和磁化の窒素濃度依存性] journal January 1994
Heat Assisted Magnetic Recording conference May 2006
Formation of iron nitride thin films with Al and Ti additives text January 2011
Giant and reversible extrinsic magnetocaloric effects in La0.7Ca0.3MnO3 films due to strain text January 2012

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