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1. 发明专利

DE112019006230T5 WEICHMAGNETISCHER WERKSTOFF UND VERFAHREN ZUR HERSTELLUNG DESSELBEN, UNDWEICHMAGNETISCHEN WERKSTOFF ENTHALTENDER ELEKTROMOTOR 未知
公开(公告)号：DE112019006230T5
公开(公告)日：2021-09-02
申请号：DE112019006230
申请日：2019-09-11
申请人： HITACHI LTD
发明人： KOMURO MATAHIRO , SATSU YUICHI , HATOU HISAMITSU , PARK SEUNGHWAN
IPC分类号： H01F1/147 , C21D1/22 , C21D6/00 , C22C38/00 , C23C8/34 , H01F13/00
摘要： Weichmagnetischer Werkstoff, der blechförmig oder folienförmig ist und eine hohe magnetische Sättigungsflussdichte aufweist, wobei der weichmagnetische Werkstoff Eisen, Kohlenstoff und Stickstoff enthält, und einen kohlenstoff- und stickstoffhaltigen Martensit und γ-Fe enthält, wobei das γ-Fe eine darin gebildete stickstoffhaltige Phase enthält. Der weichmagnetische Werkstoff wird hergestellt durch die Schritte des Erwärmens eines eisenbasierten Werkstoffes, der blechförmig oder folienförmig ist, des Carburierens des eisenbasierten Werkstoffes mit einem Carburiergas, des Dispergierens eines körnigen Carbids in α-Fe in dem eisenbasierten Werkstoff bei einer Temperatur, die gleich wie oder niedriger als eine eutektoide Temperatur ist, des Umwandelns des α-Fe in γ-Fe bei einer Temperatur, die höher ist als die eutektoide Temperatur, des Diffundierens von Stickstoff in das γ-Fe unter Verwendung eines Stickstoffzufuhrgases, um γ-Fe-N-C zu bilden, und des schnellen Erwärmens und anschließenden schnellen Abkühlens des γ-Fe-N-C, um den γ-Fe-N-C in einen Martensit umzuwandeln. Somit ist es möglich, zu geringen Kosten einen thermisch stabilen weichmagnetischen Werkstoff herzustellen, der eine magnetische Sättigungsflussdichte aufweist, die höher ist als diejenige von reinem Eisen, und die Kenngrößen eines magnetischen Kreises eines Elektromotors oder dergleichen unter Verwendung des weichmagnetischen Werkstoffes zu verbessern, um Miniaturisierung und eine Erhöhung des Drehmoments des Elektromotors oder dergleichen zu erreichen.

2. 发明专利

DE3810243C2 未知
公开(公告)号：DE3810243C2
公开(公告)日：1994-03-10
申请号：DE3810243
申请日：1988-03-25
申请人： HITACHI LTD
发明人： KOMURO MATAHIRO , KOZONO YUZO , NARISHIGE SHINJI , HANAZONO MASANOBU
IPC分类号： C23C14/08 , C30B23/02 , H01L39/12 , H01L39/14 , H01L39/24 , C04B35/50 , C04B35/00 , C30B25/02 , C30B29/22

3. 发明专利

DE102005035446B4 Seltenerdmagnet 未知
公开(公告)号：DE102005035446B4
公开(公告)日：2011-05-12
申请号：DE102005035446
申请日：2005-07-28
申请人： HITACHI LTD
发明人： KOMURO MATAHIRO , SATSU YUICHI , MAEDA KUNIHIRO , KOZONO YUZO
IPC分类号： H01F1/08 , H02K1/02

4. 发明专利

DE10310572B4 未知
公开(公告)号：DE10310572B4
公开(公告)日：2008-04-10
申请号：DE10310572
申请日：2003-03-11
申请人： HITACHI LTD
发明人： KOMURO MATAHIRO , KOMURO KATSUHIRO
IPC分类号： B22F1/00 , H01F1/09 , B22F3/02 , C22C33/02 , C22C38/00 , H01F1/053 , H01F1/08 , H01F41/02 , H02K1/02 , H02K1/22 , H02K1/27 , H02K15/03
摘要： A permanent magnet comprises a hard magnetic material that contains at least a rare earth element and an anti-ferromagnetic material, wherein the hard magnetic material and the anti-ferromagnetic material are magnetically coupled. A volume ratio of the anti-ferromagnetic material is 20% or less, based on the permanent magnet.

5. 发明专利

SG97790A1 SPIN TUNNEL MAGNETO-RESISTANCE EFFECT TYPE MAGNETIC SENSOR AND PRODUCTION METHOD THEREOF 未知
公开(公告)号：SG97790A1
公开(公告)日：2003-08-20
申请号：SG1999002116
申请日：1999-04-28
申请人： HITACHI LTD
发明人： KOMURO MATAHIRO , KAWATO YOSHIAKI
IPC分类号： G01R33/09 , G11B5/00 , G11B5/39 , H01L43/08 , G11B5/02 , G11B5/127
摘要： A magnetic sensor utilizing a spin tunnel magneto-resistance effect (TMR), comprising a tunnel insulating film (46), a first magnetic layer (47) formed on one of the planes of the tunnel insulating film, a second magnetic layer (45) formed on the other plane of the tunnel insulating film, a third magnetic layer (44) containing an anti-ferromagnetic substance for fixing magnetization of the second magnetic layer, a second insulating film (49) formed on at least one of the first and third magnetic layers and having an opening (61) in a predetermined region, a first electrode (50) electrically connected to one of the first and third magnetic layers only in the opening of the second insulating film, and a second electrode (51 or 52) for causing a current to flow between the first electrode and itself through at least the first and second magnetic layers and the first insulating layer.

6. 发明专利

DE102005035446A1 未知
公开(公告)号：DE102005035446A1
公开(公告)日：2006-03-16
申请号：DE102005035446
申请日：2005-07-28
申请人： HITACHI LTD
发明人： KOMURO MATAHIRO , SATSU YUICHI , MAEDA KUNIHIRO , KOZONO YUZO
IPC分类号： H01F1/08
摘要： In a ferromagnetic material containing at least one kind of rare-earth element, a layer containing at least one kind of alkaline earth element or rare-earth element and fluorine is formed at the grain boundary or near the powder surface of the ferromagnetic material. A further layer containing at least one kind of rare-earth element, having a fluorine concentration lower than that of the layer described first and having a rare-earth element concentration higher than that of the host phase of the ferromagnetic material, or an oxide layer containing a rare-earth element is formed in adjacent with a portion of the layer described first.

7. 发明专利

SG54556A1 Thin film magnetic head and a method of manufacturing the same 未知
公开(公告)号：SG54556A1
公开(公告)日：1998-11-16
申请号：SG1997003163
申请日：1997-08-29
申请人： HITACHI LTD
发明人： OKADA TOMOHIRO , UENO TAKUMI , KITA YOSHIAKI , NUNOKAWA ISAO , KOMURO MATAHIRO , FUYAMA MORIAKI
IPC分类号： G11B5/31 , G11B5/33

8. 发明专利

DE10310572A1 未知
公开(公告)号：DE10310572A1
公开(公告)日：2004-03-11
申请号：DE10310572
申请日：2003-03-11
申请人： HITACHI LTD
发明人： KOMURO MATAHIRO , KOMURO KATSUHIRO
IPC分类号： B22F1/00 , B22F3/02 , C22C33/02 , C22C38/00 , H01F1/053 , H01F1/08 , H01F41/02 , H02K1/02 , H02K1/22 , H02K1/27 , H02K15/03 , H01F7/02 , H01F3/10 , H01F3/08
摘要： A permanent magnet comprises a hard magnetic material that contains at least a rare earth element and an anti-ferromagnetic material, wherein the hard magnetic material and the anti-ferromagnetic material are magnetically coupled. A volume ratio of the anti-ferromagnetic material is 20% or less, based on the permanent magnet.

9. 发明专利

DE10306030A1 未知
公开(公告)号：DE10306030A1
公开(公告)日：2003-10-02
申请号：DE10306030
申请日：2003-02-13
申请人： HITACHI LTD , HITACHI METALS LTD
发明人： KOMURO MATAHIRO , KITAMURA MASASHI , ITOU MOTOYA , KURIYAMA YOSHIHIKO
IPC分类号： H01F1/08 , H01F7/02 , H01F13/00 , H01F41/02 , H02K1/27 , H02K15/03 , H02K1/12

10. 发明专利

SG55435A1 Thin film magnetic head and recording reproducing separate type magnetic head and magnetic recording reproducing apparatus using them 未知
公开(公告)号：SG55435A1
公开(公告)日：1998-12-21
申请号：SG1997004493
申请日：1997-12-17
申请人： HITACHI LTD
发明人： KOMURO MATAHIRO , OKADA TOMOHIRO , SANO MASAAKI , FUYAMA MORIAKI , FUKUI HIROSHI , HOSHINO KATSUMI , KAWABE TAKASHI , MARUYAMA YOHJI , NAKAMURA ATSUSHI , HARA MIKI , SHIMIZU NOBORU , YOSHIDA NOBUO
IPC分类号： G11B5/31 , G11B5/39 , G11B5/60
摘要： In order to prevent the recording performance from degradation in radio frequency recording, there are provided a film magnetic head and a recording reproducing sectional pattern magnetic head which has magnetic pole width less than 2 mu m and a ultra high density magnetic storage apparatus of 10 Gb/in grade. In the recording head, a lower part magnetic film serves as a shielding film of a reproducing department. A gap film of a non-magnetism is formed during the formation of the upper and lower part magnetic films. One part of the lower or upper part magnetic film has a resistivity higher by more than 80 mu OMEGA cm than other parts. The upper part magnetic film is formed by a flame galvanising. A gap department of the lower or upper part magnetic film is shaped convex.

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