公开(公告)号：US07211340B2

公开(公告)日：2007-05-01

申请号：US10765208

申请日：2004-01-28

Applicant: Thomas Patrick Nolan

Inventor： Thomas Patrick Nolan

IPC: G11B5/66

CPC classification number: G11B5/667 ,  G11B5/656 ,  Y10T428/12465 ,  Y10T428/12868 ,  Y10T428/12882 ,  Y10T428/12889 ,  Y10T428/12896 ,  Y10T428/12903 ,  Y10T428/1291

Abstract: A multiple layer structure comprising a pair of spaced-apart crystalline layers of different materials with an intermediate crystalline layer between and in contact with each of the pair of crystalline layers, the intermediate crystalline layer providing one of the crystalline layers of the pair with a stronger out-of-plane preferred growth orientation than if each of the pair of crystalline layers are in overlying contact. Disclosed and preferred embodiments include perpendicular magnetic recording media comprising the multiple layer structure as an intermediate layer structure beneath a perpendicular magnetic recording layer for strengthening a preferred out-of-plane growth orientation of the latter.

Abstract translation: 一种多层结构，其包括一对间隔开的不同材料的结晶层，其中间晶体层在所述一对结晶层中的每一个之间并与之接触，所述中间晶体层提供所述一对晶体层中的一个具有更强的 平面上优选的生长取向优于如果每一对结晶层中的每一个处于重叠接触。 公开的和优选的实施方案包括垂直磁记录介质，其包括作为在垂直磁记录层下面的中间层结构的多层结构，用于加强后者的优选的平面外生长取向。

公开(公告)号：US07201977B2

公开(公告)日：2007-04-10

申请号：US10806114

申请日：2004-03-23

Applicant: Shaoping Li ,  Kaizhong Gao ,  Lei Wang ,  Wenzhong Zhu

Inventor： Shaoping Li ,  Kaizhong Gao ,  Lei Wang ,  Wenzhong Zhu

IPC: G11B5/66

CPC classification number: G11B5/732 ,  G11B5/653 ,  G11B5/656 ,  G11B5/66 ,  G11B5/667 ,  G11B5/725

Abstract: An anti-ferromagnetically coupled, granular-continuous (“AFC-GC”) magnetic recording medium having increased thermal stability, writability, and signal-to-medium noise ratio (“SMNR”), comprising a layer stack including, in sequence from a surface of a non-magnetic substrate: (a) a continuous ferromagnetic stabilizing layer; (b) a non-magnetic spacer layer; and (c) a granular ferromagnetic recording layer; wherein: (i) the continuous ferromagnetic stabilizing and granular ferromagnetic recording layers are anti-ferromagnetically coupled across the non-magnetic spacer layer, the amount of anti-ferromagnetic coupling preselected to ensure magnetic relaxation after writing; (ii) lateral interactions in the granular, ferromagnetic recording layer are substantially completely eliminated or suppressed; and (iii) the exchange coupling strength in the continuous, ferromagnetic stabilizing layer is preselected to be slightly larger than the strength of the anti-ferromagnetic coupling provided by the non-magnetic spacer layer to thereby enhance thermal stability of the recording bits.

Abstract translation: 具有增加的热稳定性，可写性和信噪比（“SMNR”）的反铁磁耦合的粒状连续（“AFC-GC”）磁记录介质，包括层叠，其包括从 非磁性表面

公开(公告)号：US20070065955A1

公开(公告)日：2007-03-22

申请号：US10574573

申请日：2004-10-05

Applicant: Tomoyuki Maeda ,  Soichi Okawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

Inventor： Tomoyuki Maeda ,  Soichi Okawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC: G11B5/82 ,  H01L21/00

CPC classification number: G11B5/65 ,  G11B5/656 ,  G11B5/7325

Abstract: A perpendicular magnetic recording medium includes: a substrate; at least one underlayer formed above the substrate; and a perpendicular magnetic recording layer formed above the at least one underlayer, an easy magnetization axis of the perpendicular magnetic recording layer being oriented perpendicular to the substrate, the perpendicular magnetic recording layer including magnetic crystal particles and grain boundaries surrounding the magnetic crystal particles, wherein the grain boundaries contain an oxide of silicon and at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Ca, Sr, and Ba, and the ratio of a total amount of substance of Si, Li, Na, K, Rb, Cs, Ca, Sr, and Ba in the perpendicular magnetic recording layer is no less than 1 mol % and no more than 20 mol %.

Abstract translation: 垂直磁记录介质包括：基板; 至少一个底层形成在所述基底上; 以及形成在所述至少一个底层上方的垂直磁记录层，所述垂直磁记录层的易磁化轴垂直于所述衬底取向，所述垂直磁记录层包括磁性结晶颗粒和包围所述磁性结晶颗粒的晶界，其中 晶界包含硅的氧化物和选自Li，Na，K，Rb，Cs，Ca，Sr和Ba中的至少一种元素，并且Si，Li， 垂直磁记录层中的Na，K，Rb，Cs，Ca，Sr和Ba不小于1mol％且不大于20mol％。

公开(公告)号：US20070042227A1

公开(公告)日：2007-02-22

申请号：US10572780

申请日：2004-09-22

Applicant: Takeshi Iwasaki ,  Soichi Oikawa ,  Futoshi Nakamura ,  Tomoyuki Maeda ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

Inventor： Takeshi Iwasaki ,  Soichi Oikawa ,  Futoshi Nakamura ,  Tomoyuki Maeda ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

IPC: G11B5/66

CPC classification number: G11B5/65 ,  G11B5/656 ,  G11B5/667 ,  G11B5/732 ,  G11B5/7325

Abstract: To make possible high density recording by making the structure of the perpendicular magnetic recording layer finer. A perpendicular magnetic recording medium 10 includes at least a nonmagnetic under layer 2, a perpendicular magnetic layer 3, and a protective layer which are stacked on a nonmagnetic substrate 1, wherein the perpendicular magnetic layer includes ferromagnetic crystal grains and nonmagnetic crystal grain boundary regions, wherein the crystal grain boundary region includes at least two kinds of oxide.

Abstract translation: 通过使垂直磁记录层的结构更细，可以实现高密度记录。 垂直磁记录介质10至少包括层叠在非磁性基板1上的非磁性底层2，垂直磁性层3和保护层，其中垂直磁性层包括铁磁晶粒和非磁性晶粒边界区域， 其中所述晶界区包括至少两种氧化物。

公开(公告)号：US20070037015A1

公开(公告)日：2007-02-15

申请号：US11202128

申请日：2005-08-10

Applicant: Mohammad Mirzamaani ,  Kai Tang

Inventor： Mohammad Mirzamaani ,  Kai Tang

IPC: G11B5/66 ,  C23C14/00

CPC classification number: G11B5/66 ,  G11B5/656 ,  G11B5/851

Abstract: A laminated magnetic recording medium comprising two magnetic layers that are substantially decoupled. The upper magnetic layer is preferably a cobalt alloy that includes tantalum. The tantalum in the upper magnetic layer provides the advantage of improving media SNR with good media stability.

Abstract translation: 一种层叠磁记录介质，包括基本上分离的两个磁性层。 上磁性层优选为含有钽的钴合金。 上层磁性层中的钽提供了改进介质SNR的优点，具有良好的介质稳定性。

公开(公告)号：US20070020486A1

公开(公告)日：2007-01-25

申请号：US11185659

申请日：2005-07-19

Applicant: Andreas Berger ,  Eric Fullerton

Inventor： Andreas Berger ,  Eric Fullerton

IPC: G11B5/66

CPC classification number: G11B5/66 ,  G11B5/656 ,  G11B5/667 ,  G11B5/732 ,  G11B5/7325

Abstract: A perpendicular magnetic recording medium includes a metamagnetic antiferromagnetically-coupled (AFC) layer between the recording layer (RL) and the soft magnetically permeable underlayer (SUL). The metamagnetic AFC layer has essentially no net magnetic moment in the absence of a magnetic field, but is highly ferromagnetic in the presence of a magnetic field above a threshold field. Thus the metamagnetic AFC layer does not contribute to the readback signal during reading, but channels the write field to the SUL during writing because the threshold field is selected to be below the write field. An exchange-break layer EBL is located between the metamagnetic AFC layer and the RL. The metamagnetic AFC layer contains films with a crystalline structure suitable as a growth template for the EBL and RL, so the metamagnetic AFC layer also functions as part of an “effective EBL”, thereby allowing the actual EBL to be made as thin as possible.

Abstract translation: 垂直磁记录介质包括在记录层（RL）和软磁性可渗透底层（SUL）之间的超磁性反铁磁耦合（AFC）层。 在没有磁场的情况下，超磁性AFC层基本上没有净磁矩，但是在存在超过阈值场的磁场的情况下是高铁磁性的。 因此，偏磁AFC层在读取期间不对回读信号有贡献，而是在写入期间将写入场指向SUL，因为阈值域被选择为低于写入场。 交换断层EBL位于超磁性AFC层和RL之间。 超磁性AFC层含有具有适合于EBL和RL的生​​长模板的晶体结构的膜，因此，反磁性AFC层也起到“有效EBL”的一部分的作用，从而使实际的EBL尽可能薄。

公开(公告)号：US20070019328A1

公开(公告)日：2007-01-25

申请号：US11190158

申请日：2005-07-25

Applicant: Mohammad Mirzamaani ,  Kai Tang

Inventor： Mohammad Mirzamaani ,  Kai Tang

IPC: G11B5/66 ,  G11B5/82

CPC classification number: G11B5/66 ,  G11B5/656 ,  G11B5/7379 ,  G11B5/851

Abstract: An embodiment of the invention is a laminated magnetic recording medium comprising two magnetic layers that are substantially decoupled. The lower magnetic layer comprises two sublayers. The upper magnetic sublayer is preferably a cobalt alloy having lower chromium and higher boron content than the lower magnetic sublayer. The upper sublayer composition is selected to have higher coercivity (Hc), narrower PW50 and higher resolution. The lower sublayer composition is selected for higher SNR, thermal stability and better overwrite. The laminated structure can also be used in an embodiment which has a slave magnetic layer separated from the lower magnetic layer by an AFC spacer.

Abstract translation: 本发明的一个实施例是一种层叠的磁记录介质，包括基本上分离的两个磁性层。 下磁层包括两个子层。 上磁性子层优选为具有比下部磁性子层低的铬和高硼含量的钴合金。 上层组合物被选择为具有较高的矫顽力（HCC），较窄的PW 50和更高的分辨率。 选择较低的子层组合物以获得更高的SNR，热稳定性和更好的覆盖。 层叠结构也可以用于具有通过AFC间隔物与下磁性层分离的从属磁性层的实施例。

公开(公告)号：US07157161B1

公开(公告)日：2007-01-02

申请号：US10854433

申请日：2004-05-27

Applicant: Abebe Hailu ,  Charles Changging Chen ,  Mariana R. Munteanu

Inventor： Abebe Hailu ,  Charles Changging Chen ,  Mariana R. Munteanu

IPC: G11B5/66 ,  G11B5/70

CPC classification number: G11B5/7325 ,  G11B5/656

Abstract: The Hr and SNR of a magnetic recording medium are increased and the signal pulse narrowed by employing a tri-layer underlayer structure containing Cr or a Cr alloy wherein the second underlayer contains Cr and B, the first underlayer preferably contains substantially pure Cr, and the third underlayer preferably contains a ternary alloy of Cr.

Abstract translation: 通过使用含有Cr或Cr合金的三层底层结构，磁记录介质的Hr和SNR增加，信号脉冲变窄，其中第二底层含有Cr和B，第一底层优选含有基本上纯的Cr， 第三底层优选含有Cr的三元合金。

公开(公告)号：US20060286414A1

公开(公告)日：2006-12-21

申请号：US11152104

申请日：2005-06-15

Applicant: Michael Racine ,  Anirban Das ,  Steven Kennedy ,  Kyung Chung

Inventor： Michael Racine ,  Anirban Das ,  Steven Kennedy ,  Kyung Chung

IPC: G11B5/65 ,  C23C14/00 ,  C23C14/32

CPC classification number: G11B5/656 ,  C23C14/3414 ,  G11B5/851

Abstract: A sputter target, where the sputter target is comprised of cobalt (Co), platinum (Pt), a single-component oxide or a multi-component oxide, and an elemental metal additive. The elemental metal additive has a reduction potential of greater than −0.03 electron volts, and is substantially insoluble with cobalt (Co) at room temperature. The elemental metal additive is copper (Cu), silver (Ag), or gold (Au), and the sputter target is further comprised of chromium (Cr) and/or boron (B). The sputter target is comprised of between 2 atomic % and 10 atomic % copper (Cu), silver (Ag), or gold (Au) or other elemental metal additive. Accordingly, the enhanced sputter target provides significant improvements in thermal stability and SNR, through enhancements to magnetocrystalline anisotropy and increased grain-to-grain segregation.

Abstract translation: 溅射靶，其中溅射靶由钴（Co），铂（Pt），单组分氧化物或多组分氧化物和元素金属添加剂组成。 元素金属添加剂具有大于-0.03电子伏特的还原电位，并且在室温下基本上不溶于钴（Co）。 元素金属添加剂是铜（Cu），银（Ag）或金（Au），溅射靶还包含铬（Cr）和/或硼（B）。 溅射靶由2原子％至10原子％铜（Cu），银（Ag）或金（Au）或其他元素金属添加剂组成。 因此，增强的溅射靶通过增强磁晶各向异性和增加的晶粒 - 晶粒分离，提供热稳定性和SNR的显着改善。

公开(公告)号：US20060269792A1

公开(公告)日：2006-11-30

申请号：US11135703

申请日：2005-05-24

Applicant: Eric Fullerton ,  Byron Lengsfield ,  David Margulies

Inventor： Eric Fullerton ,  Byron Lengsfield ,  David Margulies

IPC: G11B5/66

CPC classification number: G11B5/66 ,  G11B5/656 ,  G11B5/667 ,  G11B5/7325

Abstract: A perpendicular magnetic recording disk has an antiferromagnetically-coupled (AFC) recording layer (RL) comprised of lower and upper ferromagnetic layers, each having a hexagonal-close-packed (hcp) crystalline structure and perpendicular magnetic anisotropy, separated by an antiferromagnetically (AF) coupling layer, wherein the lower ferromagnetic layer (LFM) has substantially higher magnetic permeability than the upper ferromagnetic layer (UFM). The AFC RL is located on an actual exchange break layer (EBL) that separates the AFC RL from the disk's soft magnetic underlayer (SUL). The LFM functions as part of an “effective” exchange break layer (EBL) that also includes the actual EBL and the AF-coupling layer, thereby allowing the actual EBL to be made as thin as possible. The hcp LFM promotes the growth of the hcp UFM in the same way the actual EBL does so that its thickness contributes to the thickness necessary to grow the hcp UFM. The effective EBL appears to be magnetically “thin” during the write process and magnetically “thick” during the readback process.