JPH0518245B2 - - Google Patents
Info
- Publication number
- JPH0518245B2 JPH0518245B2 JP59126118A JP12611884A JPH0518245B2 JP H0518245 B2 JPH0518245 B2 JP H0518245B2 JP 59126118 A JP59126118 A JP 59126118A JP 12611884 A JP12611884 A JP 12611884A JP H0518245 B2 JPH0518245 B2 JP H0518245B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- coil
- magnetic
- field generating
- solenoid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005291 magnetic effect Effects 0.000 claims description 87
- 229910000859 α-Fe Inorganic materials 0.000 claims description 4
- 230000005294 ferromagnetic effect Effects 0.000 claims description 3
- 239000003302 ferromagnetic material Substances 0.000 claims 1
- 239000000696 magnetic material Substances 0.000 description 8
- 230000035699 permeability Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910003962 NiZn Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000002223 garnet Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/20—Electromagnets; Actuators including electromagnets without armatures
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はソレノイド型コイルを用いて磁界を発
生する装置に関するものである。更に詳しく述べ
れば、発生磁界を強化することを可能とした構造
を有する磁界発生装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device that generates a magnetic field using a solenoid type coil. More specifically, the present invention relates to a magnetic field generating device having a structure that makes it possible to strengthen the generated magnetic field.
（従来技術とその問題点）
表面に垂直な強い一軸性磁気異方性を有する磁
性材料薄片中に存在する磁気バブルを利用した磁
気バブル素子に於いては、通常磁気バブルを安定
に保持する目的のために、磁性材料薄片に垂直な
バブル保持磁界（以下バイアス磁界と呼称する）
が必要である。バイアス磁界を発生するには、永
久磁石を用いる方法やソレノイド型中空コイルを
用いる方法がよく知られている。特に、磁気バブ
ル素子の諸特性を測定・評価する際には、前記バ
イアス磁界を変化させることが重要である。従つ
てこの目的のためには、バイアス磁界の発生は、
印加する電流値で自由に強度が変えられるソレノ
イド型コイルを用いるのが一般的である。(Prior art and its problems) In magnetic bubble elements that utilize magnetic bubbles existing in a thin piece of magnetic material that has strong uniaxial magnetic anisotropy perpendicular to the surface, the purpose is usually to stably hold the magnetic bubbles. Therefore, the bubble holding magnetic field (hereinafter referred to as the bias magnetic field) perpendicular to the magnetic material flake
is necessary. To generate a bias magnetic field, methods using permanent magnets and methods using solenoid-type hollow coils are well known. In particular, when measuring and evaluating various characteristics of a magnetic bubble element, it is important to change the bias magnetic field. Therefore, for this purpose, the generation of the bias magnetic field is
It is common to use a solenoid type coil whose strength can be freely changed depending on the applied current value.
一方、磁気バブル素子、特に磁気バブルを情報
の担体として利用する磁気バブルメモリ素子で
は、情報の高密度化のために、用いる磁気バブル
の径を微小化することが行なわれてきた。磁気バ
ブルを微小化するに伴つて、一般にはその磁性材
料の飽和磁化Msを大きくする必要がある。飽和
磁化が大きくなると、これに従つて磁気バブルを
安定に保持するバイアス磁界も大きくなる。例え
ば、磁性材料として磁性ガーネツト膜を用いた場
合、磁気バブル直径が3μｍ程度のときはバイア
ス磁界としては、150Oe程度であつたのが、2μｍ
直径の磁気バブルを保持するバイアス磁界は約
250Oe、1μｍ直径に対しては350e程度必要とす
る。更に0.5μｍ直径の磁気バブルを安定に保持す
るには600Oe程度のバイアス磁界が必要となる。 On the other hand, in magnetic bubble devices, particularly magnetic bubble memory devices that utilize magnetic bubbles as information carriers, efforts have been made to reduce the diameter of the magnetic bubbles used in order to increase the density of information. As magnetic bubbles become smaller, it is generally necessary to increase the saturation magnetization Ms of the magnetic material. As the saturation magnetization increases, the bias magnetic field that stably holds the magnetic bubble also increases accordingly. For example, when a magnetic garnet film is used as the magnetic material, when the magnetic bubble diameter is about 3 μm, the bias magnetic field is about 150 Oe, but it becomes 2 μm.
The bias magnetic field that holds a magnetic bubble of diameter is approximately
250Oe, approximately 350e is required for a diameter of 1μm. Furthermore, a bias magnetic field of about 600 Oe is required to stably hold a magnetic bubble with a diameter of 0.5 μm.
この様に、微小磁気バブルを利用した磁気バブ
ル素子を評価するには、高いバイアス磁界が必要
とされる。高いバイアス磁界を発生するには、磁
界発生コイルに大きな電流を印加すれば良いが、
単純なコイルはコイルに発生するジユール熱は電
流値の自乗に比例するため、バイアス磁界の上昇
に伴ない急激にコイルの温度が上昇し、安定に磁
気バブル素子の評価・測定が行なえなくなる欠点
を有している。 As described above, a high bias magnetic field is required to evaluate a magnetic bubble device using minute magnetic bubbles. To generate a high bias magnetic field, it is sufficient to apply a large current to the magnetic field generating coil, but
In simple coils, the Joule heat generated in the coil is proportional to the square of the current value, so the temperature of the coil rises rapidly as the bias magnetic field increases, making it impossible to stably evaluate and measure magnetic bubble elements. have.
（発明の目的）
本発明の目的は、上記の欠点を取り除くため、
ソレノイド型磁界発生コイルで発生する磁界の単
位電流当りの強度を大きくすることにより、同一
発生磁界に要する印加電流値を下げ、コイルの発
熱を抑制する磁界発生装置を提供することにあ
る。(Object of the invention) The object of the invention is to eliminate the above-mentioned drawbacks.
It is an object of the present invention to provide a magnetic field generating device which reduces the applied current value required for the same generated magnetic field and suppresses heat generation in the coil by increasing the strength per unit current of the magnetic field generated by a solenoid type magnetic field generating coil.
（発明の構成）
本発明による磁界発生装置の構成は、少なくと
も１つのソレノイド型磁界発生コイルを有し、該
ソレノイド型コイルの中心軸に垂直な端面に、該
中心軸に平行な法線を有する軟強磁性体平板を設
けたことを特徴とするものである。(Configuration of the Invention) The configuration of the magnetic field generating device according to the present invention includes at least one solenoid type magnetic field generation coil, and has a normal line parallel to the central axis on an end face perpendicular to the central axis of the solenoid type coil. It is characterized by the provision of a soft ferromagnetic flat plate.
（構成の詳細な説明）
本発明は、磁界発生装置を上述の構成にするこ
とにより従来技術の欠点を解決するものである。
本発明の原理は、ソレノイド型磁界発生コイルの
外端面に高透磁率軟磁性体の平板を設け、もしそ
れが無ければ、ソレノイド型磁界発生コイルの外
部分に広く分散する筈の磁束を、高透磁率磁性平
板に吸収せしめ、いわゆる鏡像効果により、ソレ
ノイド内部の磁界を強調することにある。(Detailed Description of Configuration) The present invention solves the drawbacks of the prior art by configuring the magnetic field generating device as described above.
The principle of the present invention is to provide a flat plate of high magnetic permeability soft magnetic material on the outer end surface of the solenoidal magnetic field generating coil, and to increase the magnetic flux that would otherwise be widely dispersed in the outer part of the solenoidal magnetic field generating coil. The purpose is to emphasize the magnetic field inside the solenoid by absorbing the magnetic permeability into a magnetic flat plate and using the so-called mirror image effect.
（実施例）
以下に本発明の実施例を図面を用いて説明す
る。(Example) Examples of the present invention will be described below with reference to the drawings.
実施例 １
第１図を用いて本発明の第１の実施例を説明す
る。本実施例では、磁界発生用コイルとして、ソ
レノイド型コイル１ａ，１ｂが間隙部２０を介し
て対置したヘルムホルツ型コイルを用いている。
通常この様なヘルムホルツ型磁界発生コイルで
は、磁界を印加すべき試料片５は、コイルの間隙
部２０に置く。発生する磁界２１は、コイル中心
軸に沿つた方向の成分である。Example 1 A first example of the present invention will be described with reference to FIG. In this embodiment, a Helmholtz coil in which solenoid coils 1a and 1b are opposed to each other with a gap 20 in between is used as the magnetic field generating coil.
Usually, in such a Helmholtz type magnetic field generating coil, the sample piece 5 to which a magnetic field is to be applied is placed in the gap 20 of the coil. The generated magnetic field 21 is a component in the direction along the coil center axis.
高透磁率軟磁性体の円板２ａ，２ｂが夫々穴を
ソレノイドの中心部１２と共有する様に、ソレノ
イド型コイルの中心軸に垂直な端面１０に接して
設けられている。ソレノイドコイルの寸法が、内
径32mm、外径95mm、厚さが15mmで間隙の大きさが
16mmの場合、肉厚３mmのNiZn磁性フエライトの
穴あき円板を設けると、これがない場合に比べ
て、単位電流当り約20％強い磁界が発生すること
が判明した。換言すれば、同じ発生磁界強度を得
るには、約15％少ない電流値で済む。即ち、この
磁界発生装置での消費電力は約30％減少し、ジユ
ール熱の発生はそれだけ抑えられる。 Discs 2a and 2b made of a soft magnetic material with high magnetic permeability are provided in contact with an end face 10 perpendicular to the central axis of the solenoid-type coil so as to share a hole with the central portion 12 of the solenoid. The dimensions of the solenoid coil are inner diameter 32mm, outer diameter 95mm, thickness 15mm, and the gap size is
In the case of 16 mm, it was found that when a perforated disk of NiZn magnetic ferrite with a wall thickness of 3 mm is provided, a magnetic field that is approximately 20% stronger per unit current is generated compared to the case without this disk. In other words, to obtain the same generated magnetic field strength, approximately 15% less current is required. That is, the power consumption of this magnetic field generator is reduced by about 30%, and the generation of Joule heat is suppressed accordingly.
実施例 ２
第２図を用いて、第２の実施例を説明する。本
実施例では、磁界発生用のコイルとしては前述の
第１の実施例と同様ソレノイド型コイル１ａ，１
ｂよりなるヘルムホルツ型コイルを用いる。高透
磁率軟磁性体の平板２ａ，２ｂは、前例と異な
り、コイル中央の中空部に対応する穴のない単な
る円板である。この場合、中央部の穴がないこと
により、前例では、穴を通じて外部へ分散してい
た磁束の漏れが回避出来、より完全なコイルの鏡
像が形成される。従つて、単位電流当りの発生磁
界は、更に増大をみる。本例の場合、約25％の増
大をみた。即ち、同じ磁界を発生するためには20
％少ない電流で済み、コイルの消費電力的にみれ
ば約35％の減少となる。Example 2 A second example will be described with reference to FIG. In this embodiment, the magnetic field generating coils are solenoid type coils 1a and 1, similar to the first embodiment described above.
A Helmholtz coil consisting of b is used. The flat plates 2a and 2b made of a soft magnetic material with high magnetic permeability are simply circular plates without a hole corresponding to the hollow part at the center of the coil, unlike the previous example. In this case, the absence of the central hole avoids leakage of the magnetic flux that was dispersed to the outside through the hole in the previous example, and a more perfect mirror image of the coil is formed. Therefore, the magnetic field generated per unit current will further increase. In this case, an increase of approximately 25% was observed. That is, to generate the same magnetic field, 20
% less current, resulting in a reduction of approximately 35% in terms of coil power consumption.
実施例 ３
第３図を用いて、本発明の第３の実施例を説明
する。本実施例では、第１の実施例で示した磁界
発生装置を、磁気バブル素子評価用コイルに応用
している。ソレノイド型コイルを対した間隙部２
０に、面内回転磁界発生用のコイル６を設けてあ
る。回転磁界コイルとしては、磁性フエライトリ
ングに励起用コイルを巻き付けた形状や、ヘルム
ホルツ型中空コイル等がこの目的に適している。
試料５はコイル間々隙部２０の中央部に設置され
る。Example 3 A third example of the present invention will be described with reference to FIG. In this example, the magnetic field generator shown in the first example is applied to a coil for evaluating magnetic bubble elements. Gap part 2 for solenoid type coil
0 is provided with a coil 6 for generating an in-plane rotating magnetic field. As the rotating magnetic field coil, a shape in which an excitation coil is wound around a magnetic ferrite ring, a Helmholtz type hollow coil, etc. are suitable for this purpose.
The sample 5 is placed in the center of the coil gap 20.
ソレノイド型コイルの中空部１２及びこれに対
応する穴あきの高等透率円板２ａを通して、光源
７及び観察部８よりなる顕微鏡の如き光学観察手
段により、試料の状態を、面内磁界及びこれに垂
直なコイル中心軸に沿つた磁界を印加しつつ観察
することが出来る。この様な磁界発生装置を用い
れば、前述の如き、直径0.5μｍ以下の磁気バブル
を用いた素子も、その特性を、コイル発熱を影響
を受けずに評価することが出来る。 Through the hollow part 12 of the solenoid coil and the corresponding perforated high-transmittance disk 2a, the state of the sample can be observed using an optical observation means such as a microscope consisting of a light source 7 and an observation part 8 in the in-plane magnetic field and perpendicular to this. Observations can be made while applying a magnetic field along the central axis of the coil. If such a magnetic field generator is used, the characteristics of an element using magnetic bubbles with a diameter of 0.5 μm or less as described above can be evaluated without being affected by coil heat generation.
（発明の効果）
以上に述べた様に、本発明を用いれば、単位電
流あたりの発生磁界強度が大きく、従つて同じ磁
界強度では、コイル部分での消費電力の少ない磁
界発生装置が実現される。本発明の枠材として
は、前述の高透磁率を有する磁性フエライトのみ
ならず、パーマロイの如き、高透磁率金属材料を
用いても本発明の効果は容易に得られることは、
その原理からみて当然である。又、磁界発生コイ
ルとして、ソレノイド型コイルを対置組合せした
ヘルムホルツ型のみならず、単なる１個のソレノ
イド型コイルのみに対しても本発明を実施出来る
ことは明白である。(Effects of the Invention) As described above, by using the present invention, the generated magnetic field strength per unit current is large, and therefore, for the same magnetic field strength, a magnetic field generating device can be realized that consumes less power in the coil portion. . The effect of the present invention can be easily obtained by using not only magnetic ferrite having high magnetic permeability as described above but also high magnetic permeability metal materials such as permalloy as the frame material of the present invention.
This is natural considering the principle. Furthermore, it is clear that the present invention can be practiced not only with a Helmholtz type magnetic field generating coil in which solenoid type coils are arranged in opposition, but also with a single solenoid type coil.
第１図〜第３図は本発明の実施例を示す概略図
である。
図に於いて、１ａ，１ｂはソレノイド型磁界発
生コイル、２ａ，２ｂは高透磁率磁性材料平板、
５は試料、６は面内磁界発生コイル、７は光源
部、８は観察部、１０はソレノイド型磁界発生コ
イルの中心軸に垂直な端面、１２はコイルの中空
部、２０はコイル間隙、２１はコイル中心軸に平
行な磁界を示す。
1 to 3 are schematic diagrams showing embodiments of the present invention. In the figure, 1a and 1b are solenoid type magnetic field generating coils, 2a and 2b are high permeability magnetic material flat plates,
5 is a sample, 6 is an in-plane magnetic field generating coil, 7 is a light source section, 8 is an observation section, 10 is an end face perpendicular to the central axis of the solenoid type magnetic field generating coil, 12 is a hollow part of the coil, 20 is a coil gap, 21 indicates a magnetic field parallel to the central axis of the coil.
Claims (1)
ルを有し、該ソレノイド型コイルの中心軸に垂直
な端面に、該中心軸に平行な法線を有する軟強磁
性体平板を設けたことを特徴とする磁界発生装
置。 ２ 軟磁性体平板がその中心部にソレノイド型磁
界発生コイルの内径にほぼ等しい開孔を有するこ
とを特徴とする特許請求の範囲第１項記載の磁界
発生装置。 ３ 二つのソレノイド型磁界発生コイルを対置し
たヘルムホルツ型コイルの両端面に軟強磁性体平
板を設けた特許請求の範囲第１項又は第２項記載
の磁界発生装置。 ４ 軟強磁性体としてフエライトを用いたことを
特徴とする特許請求の範囲第１項、第２項又は第
３項記載の磁界発生装置。[Claims] 1. At least one solenoid-type magnetic field generating coil is provided, and a soft ferromagnetic flat plate having a normal line parallel to the central axis is provided on an end face perpendicular to the central axis of the solenoid-type coil. A magnetic field generating device characterized by: 2. The magnetic field generating device according to claim 1, wherein the soft magnetic flat plate has an opening in its center that is approximately equal to the inner diameter of the solenoid type magnetic field generating coil. 3. The magnetic field generating device according to claim 1 or 2, wherein soft ferromagnetic flat plates are provided on both end faces of a Helmholtz coil in which two solenoid type magnetic field generating coils are placed opposite each other. 4. The magnetic field generating device according to claim 1, 2, or 3, characterized in that ferrite is used as the soft ferromagnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59126118A JPS615506A (en) | 1984-06-19 | 1984-06-19 | Generator for magnetic field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59126118A JPS615506A (en) | 1984-06-19 | 1984-06-19 | Generator for magnetic field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS615506A JPS615506A (en) | 1986-01-11 |
| JPH0518245B2 true JPH0518245B2 (en) | 1993-03-11 |
Family
ID=14927082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59126118A Granted JPS615506A (en) | 1984-06-19 | 1984-06-19 | Generator for magnetic field |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS615506A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8800122A (en) * | 1988-01-19 | 1989-08-16 | Smit Transformatoren Bv | DEVICE FOR GENERATING A MAGNETIC FIELD IN A PROCESS AREA. |
-
1984
- 1984-06-19 JP JP59126118A patent/JPS615506A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS615506A (en) | 1986-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4818966A (en) | Magnetic field generating device | |
| US3867368A (en) | Read-write magnetic transducer having a composite structure comprising a stack of thin films | |
| TW508453B (en) | Optical isolator comprising a high-performance low-cost magnet for applying magnetic field to a Faraday rotator | |
| US3893023A (en) | Magnetic bubble device for visualizing magnetic field patterns | |
| JPH0518245B2 (en) | ||
| US3181059A (en) | Optical polarity indicator for magnetically recorded signals | |
| JPH0518246B2 (en) | ||
| JPH0746647B2 (en) | Magnetic field generator | |
| JP2004302412A (en) | Magneto-optical device | |
| JPS5580818A (en) | Vertical magnetic recording head | |
| JPS62129916A (en) | Vertical magnetic head | |
| JP2002150544A (en) | Magnetic recording medium | |
| JP2005055921A (en) | Magneto-optical element and optical apparatus | |
| JP3628859B2 (en) | Magneto-optical element and optical apparatus | |
| JP3032468B2 (en) | Magnetic circuit and non-reciprocal circuit device having temperature compensation structure | |
| JPH11287974A (en) | Magnetooptic element | |
| JPH06281885A (en) | Optical isolator | |
| JPH0469801A (en) | External magnetic field applying device | |
| JPS62128045A (en) | Photomagnetic recording and reproducing device | |
| JPS60209906A (en) | Ring head for vertical magnetic recording | |
| JPH11281722A (en) | Optical fiber sensor | |
| JPS59229723A (en) | Ring type magnetic head | |
| JPS61133002A (en) | Vertical magnetic head | |
| JPS6129429A (en) | Objective lens driver for optical information recording device | |
| JPS62129909A (en) | Vertical magnetic head |