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  •  系 所 成 員 
    職  稱: 教授 系所成員: [ 退休教師 ]
    姓  名: 許仁華
    Jen-Hwa Hsu
    學  歷: 1980 美國約翰霍普金斯大學物理博士
    NTU AH: http://www.phys.ntu.edu.tw/spintronics/index.htm
    個人網址:
    房  號: 608
    電  話: (02)3366-5162
    E-Mail(1): E-Mail(2):
    研究項目:

    1. 研究發展製作各種非自然界生成的奈米磁性樣品,以探討各種磁性現像及基本磁學問題,並尋求其成為實際產品的可能性,這些樣品系統包含:

    (A) 非穩定態合金

    (B) 超微粒子薄膜

    (C) 多層式薄膜及花樣薄膜

    (D) 巨磁阻和穿透性磁阻三層接合膜

    (D) 超微細條柱狀一維系統

    2. 研究發展新磁記錄技術如垂直記錄、奈米壓印以及媒体材料如 FePt 和CoPt 系統。

    3. 研究自旋電子學現象例如電流驅動磁反轉及其應用,尤其在MRAM 方面。

    4. 研究發展新微波應用磁性亞鐵磁奈米晶與薄膜。

    重要研究成果:

    1. 製成具有最高穿透性磁阻奈米顆粒複合膜並提出新理論模型。

    2. 提出新理論模型解釋 Metal-Fe3O4 複合膜磁阻現象並發展出一種新而簡易方法以決定電子在金屬中自旋擴散長度。

    3. 發展出有效製作含鉍材料高靈敏度磁感應器。

    4. 研發出超高密度奈米儲存媒體,例如L10 FePt、CoPt。

    5. 發展新潁具高垂直磁異向能瞻L11CoPt合金薄膜。

    專利( granted):
    1.製備L10合金薄膜的方法 專利號碼:發明第 I 274788號 2007/03/01, Taiwan
    2.可調整式磁記錄媒體及其製作方法專利號碼:發明第 I 312151號 2009/07/11, Taiwan
    3.PERPENDICULAR MAGNETIC RECORDING MEDIUM AND METHOD FOR FABRICATING THE SAME專利號碼:US第7,993,766號 2011/08/09, USA
    4.METHOD FOR ORDERING A DISORDERED ALLOY AND METHOD FOR MAKING A PERPENDICULAR MAGNETIC RECORDING MEDIUM專利號碼:US第8,337,637號 2012/12/25, USA
    5.金的序化方法及其垂直記錄媒體的製作方法申請專利號碼:發明第 I 400698號 2013/07/01, Taiwan
    6.MAGNETIC MATERIAL專利號碼:US第8491730B2號 2013/07/23, USA
    7.具奈米級釘札效應的磁性材料專利號碼:發明第 I 421353號 2014/01/01, Taiwan
    8.資料儲存裝置及其儲存方法專利號碼:發明 第 ?號 2014/03/18, Taiwan

    專利( pending):
    1.可三維平面磁傳感器 申請案號:101124979號 2012/07/11, Taiwan
    2.可三維平面磁傳感器 申請案號:13/597,505號 2012/08/29, USA
    3.可三維平面磁傳感器 申請案號:10 2013 011 388.1 2013/07/09, Germany
    4.可三維平面磁傳感器 申請案號:201210242300.1 2012/07/13, China
    5.磁場感測裝置 申請案號:102143500號 2013/11/28, Taiwan
    1.Fu-Te Yuan, An-Cheng Sun, C. F. Huang, and Jen-Hwa Hsu, 2014 “Intra-grain perpendicular percolated L11 CoPt thin films,” Nanotechonology, in press (2014).
    2.Chau-Yi Tsai, P. Saravanan, Jen-Hwa Hsu*, C-Y. Kuo, and K-F. Lin, 2014, “A comparative study on the PMA behavior of 5-nm thick Co49Pt51films grown at room temperature and at high temperature on glass substrates,” J. Magn. Magn. 361, 7-11 (2014).
    3.C. Y. Tsai, Jen-Hwa Hsu*, P. Saravanan, and K. F. Lin, 2014 “Study on the occurrence of spontaneously established perpendicular exchange bias in Co49Pt51/IrMn bilayers,” J. Appl. Phys. 115, 17D726 (2014).
    4.Chuan-Fa Huang, An-Cheng Sun*, Hsian-Yuan Wu, Fe-Te Yuan, and Jen-Hwa Hsu*, 2014, “Sputtering perpendicular magnetic anisotropy CoPt thin film on glass substrate at room temperature,” J. Appl. Phys. 115, 17C118 (2014).
    5.P. Saravanan*, Jen-Hwa Hsu*, D. Sivaprahasam and S.V. Kamat, 2013, “Structural and magnetic properties of gamma-Fe2O3 nanostructured compacts processed by spark plasma sintering,” J. Magn. Magn. Mater. 346, 175-177 (2013).
    6.P. Saravanan, Jen-Hwa Hsu*, and S.V. Kamat, 2013, “Granular films of Fe/Sm-Co magnetic nanocomposites through spin-assisted layer-by-layer deposition,” J. Nanoparticle Research, 15(12), 1-8 (2013).
    7.Jen-Hwa Hsu, An-Cheng Sun, and Puneet Sharma*, 2013, “Lateral grain size effect on exchange bias in polycrystalline NiFe/FeMn bilayers,” Thin Solid Film, 542, 87-90 (2013).
    8.Yi-Hung Lin, Jen-Hwa Hsu*, F. T. Yuan, P. C. Kuo and J. K. Mei, 2013 “Microstructure and magnetic performance of perpendicularly magnetic anisotropic Fe3Pt/Fe2Pt/FePt/MgO(001) graded films,” IEEE. Trans. Magn. 49(7), 3679-3682 (2013).
    9.P. Saravanan*, Jen-Hwa Hsu*, G.L.N. Reddy, Sanjiv Kumar and S.V. Kamat, 2013 “Annealing induced compositional changes in SmCo5/Fe/SmCo5 exchange spring trilayers and its impact on magnetic properties,” J. Alloys and Compd. 574, 191-195 (2013).
    10.F. T. Yuan, C. Y. Tsai, Jen-Hwa Hsu*, K. F. Lin, and J. K. Mei, 2013, “Ta/NiFe/FeMn Thin Films with Enhanced Exchange Bias Prepared at Room Temperature by Rotational Deposition,” Thin Solid Film, 536, 244-248 (2013).
    11.P. Saravanan*, Jen-Hwa Hsu*, Anabil Gayen, Akhilesh K Singh, A Perumal, G L N Reddy, Sanjiv Kumar and S V Kamat, 2013, “Effect of Fe Layer thickness and Fe/Co intermixing on the magnetic properties of Sm-Co/Fe bilayer exchange-spring magnets,” J. Phys. D: Applied Phys. 46, 155002 (2013).
    12.An-Cheng Sun*, Chung-Fa Huang, F. T. Yuan and Jen-Hwa Hsu*, 2013, “Microstructures and magnetic properties of L11 CoPt thn films with additions of SiO2 and MgO,” Thin Solid Film, 531, 476-480 (2013).
    13.Y. N. Han, F. T. Yuan, Y. H. Lin, Jen-Hwa Hsu* and J. K. Mei, 2012, “Control of surface morphology and magnetic properties by ion bombardment in FePt thin films,” IEEE. Trans. Magn. 48(11), 3158 (2012).
    14.F. T. Yuan, Jen-Hwa Hsu*, A. C. Sun*, S. N. Hsiao, and H. Y. Lee, 2012, “Low-temperature ordering of FePt thin films induced by glow-discharge ion bombardment,” Appl. Phys. Lett. 101, 092406 (2012).
    15.F. T. Yuan, Jen-Hwa Hsu*, A. C. Sun*, S. N. Hsiao, and H. Y. Lee, 2012, “Low-temperature ordering of FePt thin films induced by glow-discharge ion bombardment,” Appl. Phys. Lett. 101, 092406 (2012).
    16.Fu-Te Yuan, Yi-Hung Lin, J. K. Mei, Jen-Hwa Hsu*, and P. C. Kuo, 2012, “Structure and magnetic properties of FePt(001) graded films deposited on glass substrates,” J. Appl. Phys. 111, 07B715 (2012).
    17.Fu-Te Yuan, Yi-Hung Lin, J. K. Mei, Jen-Hwa Hsu*, and P. C. Kuo, 2012, “ Effect of thickness of MgO, Co-Fe-B, and Ta layers on perpendicular magnetic anisotropy of [Ta/Co60Fe20B20/MgO]5 multilayered films,” J. Appl. Phys. 111, 07C111 (2012).
    18.Fu-Te Yuan, Long-Jie Lee, Jen-Hwa Hsu, S. N. Hsiao, H. Y. Lee, H. C. Lu, S. F. Wang, C. Y. Shen, and An-Cheng Sun*, 2012, “Fabrication of L11 Co-Pt-Cu perpendicular anisotropic films with enhanced coercivity on glass substrate,” J. Appl. Phys. 111, 07A706 (2012).
    19.Atul Thakur, Preeti Thakur, Jen-Hwa Hsu*, 2012, “Magnetic behaviour of Ni0.4Zn0.6Co0.1Fe1.9O4 spinel nano-ferrite,” J. Appl. Phys. 111, 07A305 (2012).
    20.Fu-Te Yuan, Jen-Hwa Hsu*, Yi-Hung Lin, S. N. Hsiao, and H. Y. Lee, 2012 “Structural studies of high-Ku metastable CoPt thin films with long-range order,” J. Appl. Phys. 111, 07A303 (2012).
    21.J. K. Mei, F. T. Yuan, W. M. Liao, Y. D. Yao, H. M. Lin, J. H. Hsu, and H. Y. Lee, 2011, “Rapid Thermal Annealing Induced Metastable Phase in FePt Thin Films,” IEEE. Trans. Magn. 47, 3629 (2011).
    22.Atul Thakur, Preeti Thakur, Jen-Hwa Hsu*, 2011, “Enhancement in Dielectric and Magnetic Properties of In3+ Substituted Ni-Zn Nano-Ferrites by Coprecipitation Method,” IEEE. Trans. Magn. 47, 4336 (2011).
    23.S. Narendra Babu, Jen-Hwa Hsu*, Y. S. Chen, and J. G. Lin, 2011 “Magnetoelectric studies on novel lead-free multiferroic NiFe2O4-Na0.5Bi0.5TiO3 composites,” J. Appl. Phys. 109, 07D904 (2011).
    24.Fu-Te Yuan, An-Cheng Sun, Jen-Hwa Hsu*, C. S. Tan, P. C. Kuo, W. M. Liao, and H. Y. Lee, 2011 “Coercivity enhancement in L11 Co50-xCuxPt50 thin films,” J. Appl. Phys. 109, 07B714 (2011).
    25.Fu-Te Yuan, An-Cheng Sun*, Jen-Hwa Hsu, W. M. Liao, and H. Y. Lee, 2011 “Low temperature growth of FePt and CoPt films on MgO(111) substrate", J. Appl. Phys. 109, 07B743 (2011).
    26.J. K. Mei, Fu-Te Yuan*, W. M. Liao, Y. D. Yao*, H. M. Lin, H. Y. Lee, and Jen-Hwa Hsu*, 2011 “Effect of initial stress/strain state on formation of (001) preferred orientation in FePt thin film,” J. Appl. Phys. 109, 07A737 (2011).
    27.Fu-Te Yuan*, Y. D. Yao, S. F. Lee, and Jen-Hwa Hsu, 2011, “Coercive mechanism and training effect in FeAu/NiFe bilayer films,” J. Appl. Phys. 109, 07E148 (2011).
    28.Atul Thakur, Preeti Thakur, Jen-Hwa Hsu*, 2011 “Smart magnetodielectric nano-materials for the very high frequency applications,” J. Alloys and Compd. 509, 5315 (2011).
    29.Atul Thakur, Preeti Thakur, Jen-Hwa Hsu*, 2011 “Novel magnetodielectric nano-materials with matching permeability and permittivity for the very high frequency applications,” Scripita Materillia, 64, 205 (2011).
    30.Fu-Te Yuan, An-Cheng Sun, Jen-Hwa Hsu*, C. S. Tan, P. C. Kuo, W. M. Liao, and H. Y. Lee, 2010, “Enhancement of perpendicular coercivity in L11 CoPt thin films by replacement of Co with Cu,” J. Appl. Phys. 108, 113909 (2010).
    31.S. Narendra Babu, Jen-Hwa Hsu*, Y, S, Chen, and J. G. Lin, 2010 “Dielectric, magnetic and magnetoelectric properties of multiferroic BiFe0.5Cr0.5O3-NiFe2O4 composites,” J. Appl. Phys. 107, 09D919 (2010).
    32.F. T. Yuan, A. C. Sun, and Jen-Hwa Hsu*, 2010 “Effect of underlayer (Pt, Ru, Au, and Ag) on L11 ordering in sputtered CoPt thin films,” Scripta Materillia, 62, 762 (2010).
    33.An-Cheng Sun, F. T. Yuan, Jen-Hwa Hsu*, W. M. Liao, and H. Y. Lee, 2009 “Effect of bombardment with different ions(H, He, Ar) on ordering transformation of Fe48Pt52,” J. Appl. Phys. 105, 07B719 (2009).
    34.An-Cheng Sun, F. T. Yuan, Jen-Hwa Hsu*, Y. H. Lin, and P.C. Kuo, 2009 “Magnetic reversal behaviors of perpendicular exchange-coupled Fe/FePt bilayers films,” IEEE Trans. on Magn. 45, 2709 (2009).
    35.C. Yu, T. W. Chiang, Y. S. Chen, K. W. Cheng, D. C. Chen, S. F. Lee, Y. Liou, Jen-Hwa Hsu, and Y. D. Yao, 2009 “Variation of magnetization reversal in pseudo-spin-valve elliptical rings,” Appl. Phys. Lett. 94, 233103(2009)..
    36.A. C. Sun, F. T. Yuan, Jen-Hwa Hsu*, and H. Y. Lee, 2009 “Evolution of structure and magnetic properties of sputtered-deposited CoPt thin films on MgO(111) substrates: formation of the L11 phase,” Scripta Materillia, 61, 713(2009).
    37.Shien-Wen Wang, A. C. Sun, F. T. Yuan, Jen-Hwa Hsu*, and P.C. Kuo, 2009 “Formation of ordered FePt(001) texture with reduced diffusion length,” IEEE Trans. on Magn. 45, 3580 (2009).
    38.Su-Pen Yu, Yi-Hsien Liu, An-Cheng Sun, and Jen-Hwa Hsu*, 2009 “Determining the size distribution of magnetic nanoparticles based on analysis of magnetization curves,” J. Appl. Phys. 106, 103905 (2009).
    39.An-Cheng Sun, Jen-Hwa Hsu*, P. C. Kuo, and H. L. Huang, 2007 “Onset of hard magnetic L10 FePt phse with (001) texture,” Thin Solid Film, 516, 1155-1159 (2008).
    40. An-Cheng Sun, Y. C. Tsai, Jen-Hwa Hsu*, P. C. Kuo, and H. L. Huang, 2008 “Microstructural and magnetic studies of L10 FePt-SiO2 nano-composite tin film with columnar structure for perpendicular magnetic recording,” J. Magn. Magn. Mater. 320, 3071 (2008).
    41.An-Cheng Sun, Y. C. Tsai, Jen-Hwa Hsu*, P. C. Kuo, and H. L. Huang, 2008 “Comparative evaluation of performance of percolated perpendicular media using FePt-MgO/Pt/Cr trilayer and FePt-MgO/MgO bilayer,” J. Magn. Magn. Mater. 320, 3169 (2008).
    42.Puneet Sharma, Jen-Hwa Hsu*, and Amitabh Verma, 2008 “Implementing mixture design to predict magnetic properties of hybrid-bonded magnets,” IEEE Trans. on Magn. 44, 4262 (2008).
    43.An-Cheng Sun, Y. C. Tsai, Fu-Te Yuan, Jen-Hwa Hsu*, and P. C. Kuo,2008 “Effect of MgO addition on structural and magnetic properties of (001)-textured FePt thin films,” IEEE Trans. on Magn. 44, 3531 (2008).
    44.An-Cheng Sun, Jen-Hwa Hsu*, C. H. Sheng, P. C. Kuo, and H. L. Huang, “Grain size reduction by doping Cr underlayer with Ru for longitudinal magnetic recording media,” IEEE Trans. on Magn. 43, 882 (2007).
    45.Jen-Hwa Hsu*, Zhi-Long Xue, Ta-Chieh Huang, Zung-Hang Wei, and Mei-Fang Lai, “Oscillatory behavior of coercivity in Bi/Co bilayers,” J. Magn. Magn. Mater. 310, 2239 (2007), NSC94-2120-M-002-011.
    46.Y. S. Chen, K. W. Cheng, C. Yu, S. F. Lee, Y. Liou, Jen-Hwa Hsu*, and Y. D. Yao, “Magnetic reversal for different shaped corners in submicron half-ring wires by mean phase analyses of magnetic force microscopy,” J. Magn. Magn. Mater. 310, 2606 (2007).
    47.An-Cheng Sun, Jen-Hwa Hsu*, P. C. Kuo, H. L. Huang, H. C. Lu, and S. F. Wang, “Thickness limit in perpendicular magnetic anisotropy L10 FeOt(001) thin films,”J. Magn. Magn. Mater. 310, 2650 (2007).
    48.Jen-Hwa Hsu*, Chi-Long Xue, D. Sahu, “A transition of interlayer coupling from antiferromagnetic to ferromagnetic observed at low temperatures in CoFe/Bi/Co trilayers,” J. Appl. Phys., 101, 09D114 (2007).
    49.An-Cheng Sun, Jen-Hwa Hsu*, P. C. Kuo, and H. L. Huang, “Magnetic properties of percolated perpendicular FePt-MgO films,” IEEE. Trans. Magn. 43, 2130 (2007).
    50.Jen-Hwa Hsu*, S. H. Hung, Subhayan Biswas, Puneet Sharma, and J. G. Lin, “Enhancement of ordering tmeperatures of La0.67Ca0.33MnO3 thin films by adding Ho atoms,” phys. stat. sol. (b) 244, 12, 4558-4561 (2007).
    51. An-Cheng Sun, Y. C. Tsai, Jen-Hwa Hsu*, P. C. Kuo, and H. L. Huang, “Percolated perpendicular medium of FePt-MgO/MgO bilayer films for ultra-high magnetic recording,” phys. stat. sol. (c) 4, 12, 4487-4492 (2007).
    52.A. C. Sun, Jen-Hwa Hsu*, H. L. Huang, and P. C. Kuo, “Reduction of grain size and intergrain interaction in FePt/Pt/Cr trilayer thin films for perpendicular magnetic recording,” J. Appl. Phys. 99, 08E709(2006).
    53.Jen-Hwa Hsu*, H. X. Wang, A.C. Sun and P. C. Kuo, “Atypical time-dependent magnetic behaviors of Fe-Bi films,” J. Appl. Phys. 99, 08F106 (2006).
    54.A. C. Sun, Jen-Hwa Hsu*, H. L. Huang, and P.C. Kuo, “Effects of Cr underlayer and Pt buffer layer on the interfacial structure and magnetic characteristics of sputtered films,” J. Magn. Magn. Mater. 304,106 (2006).
    55.Jen-Hwa Hsu*, Xhi-Long Xue, and A. C. Sun, “Modifying interlayer coupling in CoFe/Bi/Co trilayer junction by post-annealing treatments,” J. Magn. Magn. Mater. 304, e318 (2006).
    56.S. H. Liu, H. M. Tsai, C. W. Pao, J. W. Chiou, D. C. Ling, W. F. Fong, M. H. Tsai, H. J. Lin, J. F. Lee, and Jen-Hwa Hsu, “The electronic structure and magnetic properties of Ag-doped Fe3O4 films studies by x-ray absorption spectroscopy,” Appl. Phys. Lett. 89, 092112 (2006).
    57.C. K. Yang, J. W. Chiou, H. M. Tsai, C. W. Pao, J. C. Jan, S. C. Rasy, C. L. Yeh, K. C. Huang, H. C. Hsieh, W. F. Pong, M. H. Tsai, H. H. Hsieh, H. J. Lin, T. Y. Hou, and Jen-Hwa Hsu, “Electronic structure and magnetic properties of Al-doped Fe3O4 films studies by x-ray absorption and magnetic circular dichrosim,”Appl. Phys. Lett. 86, 062504 (2005).
    58.Jen-Hwa Hsu* and D. P. Sahu, “Interlayer coupling in a trilayer junction having bismuth a spacer layer,” Appl. Phys. Lett., 86, 192501(2005).
    59.Jun-Yang Lai, Mei-Feng Lai, Ching-Ray Chang, Zung-Hang Wei, J. C. Wu, I. C. Lo, J. H. Kuo, Y. C. Chang, Jen-Hwa Hsu, and Jia-Rui Huang, “Effects of interparticle dipole interaction on permalloy thin film arrays,” J. Appl. Phys. 97, 10J504 (2005).
    60.Jen-Hwa Hsu, Hong-Xian Wang, P. C. Kuo, “Evolution of magnetoresistance effect in iron-bismuth films,” J. Magn. Magn. Mater. 294, 99 (2005).
    61.A. C. Sun, S. C. Chen, P. C. Kuo, C. Y. Chou, Y. H. Fang, Jen-Hwa Hsu, and H. L. Huang, and H. W. Chang “Reduction of grain size and ordering temperature in L10 FePt thin films,” IEEE Trans. on Magn. 41, 3772 (2005).
    62.A. C. Sun, P. C. Kuo, Jen-Hwa Hsu*, H. L. Huang, and Jui-Ming Sun, “Mechanism of epitaxial growth of L10 FePt thin films on Pt/Cr bilayer with amorphous glass substrate,” J. Appl. Phys., 98, 076109 (2005).

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