@article{goll_stadelmaier_kronmuller_2010, title={Samarium-cobalt 2:17 magnets: Analysis of the coercive field of Sm-2(CoFeCuZr)(17) high-temperature permanent magnets}, volume={63}, number={2}, journal={Scripta Materialia}, author={Goll, D. and Stadelmaier, H. H. and Kronmuller, H.}, year={2010}, pages={243–245} } @article{stadelmaier_kronmuller_goll_2010, title={Samarium-cobalt 2:17 magnets: Identifying Smn+1Co5n-1 phases stabilized by Zr}, volume={63}, number={8}, journal={Scripta Materialia}, author={Stadelmaier, H. H. and Kronmuller, H. and Goll, D.}, year={2010}, pages={843–846} } @article{stadelmaier_2009, title={Nd-Fe-B permanent magnets a quarter century later: implications for patentability}, volume={100}, ISSN={["2195-8556"]}, DOI={10.3139/146.110090}, abstractNote={Abstract}, number={5}, journal={INTERNATIONAL JOURNAL OF MATERIALS RESEARCH}, author={Stadelmaier, Hans H.}, year={2009}, month={May}, pages={635–639} } @article{stadelmaier_goll_kronmuller_2005, title={Permanent magnet alloys based on Sm2Co17; phase evolution in the quinary system Sm-Zr-Fe-Co-Cu}, volume={96}, number={1}, journal={Zeitschrift fur MetallkundeAmerican Journal of Physiology}, author={Stadelmaier, H. H. and Goll, D. and Kronmuller, H.}, year={2005}, pages={17–23} } @article{goll_kronmuller_stadelmaier_2004, title={Micromagnetism and the microstructure of high-temperature permanent magnets}, volume={96}, ISSN={["0021-8979"]}, DOI={10.1063/1.1809250}, abstractNote={Sm 2 ( Co , Cu , Fe , Zr ) 17 permanent magnets with their three-phase precipitation structure (cells, cell walls, and lamellae) show two characteristic features which so far are difficult to interpret but which are the prerequisites for high-temperature applications: (1) The hard magnetic properties only develop during the final step of the three-step annealing procedure consisting of homogenization, isothermal aging, and cooling. (2) Depending on the composition and on the annealing parameters, the temperature dependence of the coercivity can be easily changed from the conventional monotonic to the recent nonmonotonic behavior showing coercivities up to 1T even at 500K. The magnetic hardening during cooling is due to the fact that the cell walls order chemically and structurally during the cooling process. From an analysis of electron diffraction patterns of the superimposed structures existing before and after cooling it could be proven that a phase transition from a phase mixture of defective phases 2:17, 2:7, and 5:19 to the ordered 1:5 phase takes place in the cell walls during cooling. The nonmonotonic temperature dependence of the coercivity is narrowly related to the magnetic hardening mechanism which can be either pinning or nucleation and results from the magnetic and microstructural properties of the cell walls. These properties have been determined quantitatively from hysteresis loop measurements and from high-resolution transmission electron microscopy and energy dispersive x-ray analysis. Due to the temperature dependence of the intrinsic magnetic properties, the nonmonotonic temperature dependence of the coercivity is found to be determined by repulsive pinning of domain walls at the cell walls at low temperatures, by attractive pinning of domain walls in the cell walls at intermediate temperatures, and by nucleation at high temperatures. This complex temperature behavior is also reflected in characteristic changes of the angular dependence of the coercivity and can be described quantitatively on the basis of micromagnetism.}, number={11}, journal={JOURNAL OF APPLIED PHYSICS}, author={Goll, D and Kronmuller, H and Stadelmaier, HH}, year={2004}, month={Dec}, pages={6534–6545} } @article{stadelmaier_petzow_2002, title={Metastable alloys at moderate cooling rates}, volume={93}, number={10}, journal={Zeitschrift fur MetallkundeAmerican Journal of Physiology}, author={Stadelmaier, H. H. and Petzow, G.}, year={2002}, pages={1019–1023} } @article{reed_el-masry_stadelmaier_ritums_reed_parker_roberts_bedair_2001, title={Room temperature ferromagnetic properties of (Ga, Mn)N}, volume={79}, ISSN={["1077-3118"]}, DOI={10.1063/1.1419231}, abstractNote={Dilute magnetic semiconductor GaN with a Curie temperature above room temperature has been achieved by manganese doping. By varying the growth and annealing conditions of Mn-doped GaN we have identified Curie temperatures in the range of 228–370 K. These Mn-doped GaN films have ferromagnetic behavior with hysteresis curves showing a coercivity of 100–500 Oe. Structure characterization by x-ray diffraction and transmission electron microscopy indicated that the ferromagnetic properties are not a result of secondary magnetic phases.}, number={21}, journal={APPLIED PHYSICS LETTERS}, author={Reed, ML and El-Masry, NA and Stadelmaier, HH and Ritums, MK and Reed, MJ and Parker, CA and Roberts, JC and Bedair, SM}, year={2001}, month={Nov}, pages={3473–3475} } @article{reed_ritums_stadelmaier_reed_parker_bedair_el-masry_2001, title={Room temperature magnetic (Ga,Mn)N: a new material for spin electronic devices}, volume={51}, ISSN={["0167-577X"]}, DOI={10.1016/S0167-577X(01)00342-1}, abstractNote={A new dilute magnetic semiconductor (Ga,Mn)N grown by metal organic chemical vapor deposition (MOCVD) is reported. Vibrating sample magnetometer (VSM) and extraordinary Hall effect (EHE) measurements verified a ferromagnetic component at room temperature. The direction of the easy axis and the Curie temperature varies with the growth conditions, the latter ranging from 38°C to 75°C. Secondary ion mass spectroscopy (SIMS) confirms diffusion of Mn into the GaN to a depth of 380 Å.}, number={6}, journal={MATERIALS LETTERS}, author={Reed, ML and Ritums, MK and Stadelmaier, HH and Reed, MJ and Parker, CA and Bedair, SM and El-Masry, NA}, year={2001}, month={Dec}, pages={500–503} } @article{grieb_henig_reinsch_petzow_buschow_de mooij_stadelmaier_2001, title={The ternary system Fe-Nd-C}, volume={92}, number={2}, journal={Zeitschrift fur MetallkundeAmerican Journal of Physiology}, author={Grieb, B. and Henig, E. T. and Reinsch, B. and Petzow, G. and Buschow, K. H. J. and De Mooij, D. B. and Stadelmaier, H. H.}, year={2001}, pages={172–178} } @article{stadelmaier_2000, title={Magnetic properties of materials}, volume={287}, number={2}, journal={Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing}, author={Stadelmaier, H. H.}, year={2000}, pages={138–145} } @article{reed_liu_roberts_stadelmaier_bedair_el-masry_2000, title={The planar Hall effect in MnSb films and MnSb-based multilayer structures grown on (111)B GaAs}, volume={218}, ISSN={["0304-8853"]}, DOI={10.1016/S0304-8853(00)00403-0}, abstractNote={We report on the planar Hall effect properties of ferromagnetic MnSb films in ferromagnetic/nonmagnetic multilayer structures. We demonstrate an enhancement of the relative planar Hall resistivity when MnSb is used in multilayer structures. In single-layer MnSb films, the relative planar Hall resistivity is ∼2.5%, while the multilayer structures demonstrate up to ∼41% change. The following structures were prepared by pulsed laser deposition and grown on (1 1 1)B GaAs: epitaxial and polycrystalline MnSb thin films, MnSb/Bi multilayers and Mn/Sb/Mn/Bi multilayers. The multilayer structures also demonstrate temperature dependence, as the relative resistivity decreases to ∼30% when the temperature decreases to 100 K.}, number={2-3}, journal={JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS}, author={Reed, ML and Liu, SX and Roberts, JC and Stadelmaier, HH and Bedair, SM and El-Masry, NA}, year={2000}, month={Aug}, pages={177–181} } @article{stadelmaier_reinsch_petzow_1998, title={Samarium cobalt phase equilibria revisited; Relevance to permanent magnets}, volume={89}, number={2}, journal={Zeitschrift fur MetallkundeAmerican Journal of Physiology}, author={Stadelmaier, H. H. and Reinsch, B. and Petzow, G.}, year={1998}, pages={114–118} } @article{muller_stadelmaier_reinsch_petzow_1997, title={Constitution of Mn Al (Cu,Fe,Ni Or C) alloys near the magnetic tau phase}, volume={88}, number={8}, journal={Zeitschrift fur MetallkundeAmerican Journal of Physiology}, author={Muller, C. and Stadelmaier, Hans H. and Reinsch, B. and Petzow, G.}, year={1997}, pages={620–624} } @misc{stadelmaier_el-masry_1988, title={Method of producing high performance permanent magnets}, volume={RE32,714}, number={1988 Jul. 29}, publisher={Washington, DC: U.S. Patent and Trademark Office}, author={Stadelmaier, H. H. and El-Masry, N. A.}, year={1988} } @misc{stadelmaier_el-masry_1985, title={Method of producing high performance permanent magnets}, volume={4,541,877}, number={1985 Sep. 17}, publisher={Washington, DC: U.S. Patent and Trademark Office}, author={Stadelmaier, H. H. and El-Masry, N. A.}, year={1985} } @misc{elmasry_bedair_reed_stadelmaier, title={Transition metal doped ferromagnetic III-V nitride material films and methods of fabricating the same}, volume={6,955,858}, publisher={Washington, DC: U.S. Patent and Trademark Office}, author={ElMasry, N. A. and Bedair, S. M. and Reed, M. L. and Stadelmaier, H.} }